diff --git a/code/__defines/misc.dm b/code/__defines/misc.dm
index 1a74eeccbc..b570aee7c6 100644
--- a/code/__defines/misc.dm
+++ b/code/__defines/misc.dm
@@ -188,9 +188,9 @@
 #define NTNET_SYSTEMCONTROL 4		// Control of various systems, RCon, air alarm control, etc.
 
 // NTNet transfer speeds, used when downloading/uploading a file/program.
-#define NTNETSPEED_LOWSIGNAL 0.025	// GQ/s transfer speed when the device is wirelessly connected and on Low signal
-#define NTNETSPEED_HIGHSIGNAL 0.1	// GQ/s transfer speed when the device is wirelessly connected and on High signal
-#define NTNETSPEED_ETHERNET 0.5		// GQ/s transfer speed when the device is using wired connection
+#define NTNETSPEED_LOWSIGNAL 0.1	// GQ/s transfer speed when the device is wirelessly connected and on Low signal
+#define NTNETSPEED_HIGHSIGNAL 0.5	// GQ/s transfer speed when the device is wirelessly connected and on High signal
+#define NTNETSPEED_ETHERNET 1.0		// GQ/s transfer speed when the device is using wired connection
 
 // Program bitflags
 #define PROGRAM_ALL 7
diff --git a/code/modules/modular_computers/computers/item/modular_computer.dm b/code/modules/modular_computers/computers/item/modular_computer.dm
index bc041adbd5..534f6b573e 100644
--- a/code/modules/modular_computers/computers/item/modular_computer.dm
+++ b/code/modules/modular_computers/computers/item/modular_computer.dm
@@ -28,7 +28,12 @@
 	var/icon_state_menu = "menu"							// Icon state overlay when the computer is turned on, but no program is loaded that would override the screen.
 	var/max_hardware_size = 0								// Maximal hardware size. Currently, tablets have 1, laptops 2 and consoles 3. Limits what hardware types can be installed.
 	var/steel_sheet_cost = 5								// Amount of steel sheets refunded when disassembling an empty frame of this computer.
+	var/light_strength = 0
 
+	// Damage of the chassis. If the chassis takes too much damage it will break apart.
+	var/damage = 0				// Current damage level
+	var/broken_damage = 50		// Damage level at which the computer ceases to operate
+	var/max_damage = 100		// Damage level at which the computer breaks apart.
 
 	// Important hardware (must be installed for computer to work)
 	var/obj/item/weapon/computer_hardware/processor_unit/processor_unit				// CPU. Without it the computer won't run. Better CPUs can run more programs at once.
@@ -59,6 +64,22 @@
 
 	proc_eject_id(usr)
 
+// Eject ID card from computer, if it has ID slot with card inside.
+/obj/item/modular_computer/verb/eject_usb()
+	set name = "Eject Portable Device"
+	set category = "Object"
+	set src in view(1)
+
+	if(usr.incapacitated() || !istype(usr, /mob/living))
+		usr << "<span class='warning'>You can't do that.</span>"
+		return
+
+	if(!Adjacent(usr))
+		usr << "<span class='warning'>You can't reach it.</span>"
+		return
+
+	proc_eject_usb(usr)
+
 /obj/item/modular_computer/proc/proc_eject_id(mob/user)
 	if(!user)
 		user = usr
@@ -82,6 +103,17 @@
 	update_uis()
 	user << "You remove the card from \the [src]"
 
+/obj/item/modular_computer/proc/proc_eject_usb(mob/user)
+	if(!user)
+		user = usr
+
+	if(!portable_drive)
+		user << "There is no portable device connected to \the [src]."
+		return
+
+	uninstall_component(user, portable_drive)
+	update_uis()
+
 /obj/item/modular_computer/attack_ghost(var/mob/observer/dead/user)
 	if(enabled)
 		ui_interact(user)
@@ -99,6 +131,13 @@
 		user << "You emag \the [src]. It's screen briefly shows a \"OVERRIDE ACCEPTED: New software downloads available.\" message."
 		return 1
 
+/obj/item/modular_computer/examine(var/mob/user)
+	..()
+	if(damage > broken_damage)
+		user << "<span class='danger'>It is heavily damaged!</span>"
+	else if(damage)
+		user << "It is damaged."
+
 /obj/item/modular_computer/New()
 	START_PROCESSING(SSobj, src)
 	update_icon()
@@ -108,7 +147,7 @@
 	kill_program(1)
 	STOP_PROCESSING(SSobj, src)
 	for(var/obj/item/weapon/computer_hardware/CH in src.get_all_components())
-		qdel(CH)
+		uninstall_component(null, CH)
 	return ..()
 
 /obj/item/modular_computer/update_icon()
@@ -116,7 +155,9 @@
 
 	overlays.Cut()
 	if(!enabled)
+		set_light(0)
 		return
+	set_light(light_strength)
 	if(active_program)
 		overlays.Add(active_program.program_icon_state ? active_program.program_icon_state : icon_state_menu)
 	else
@@ -175,9 +216,27 @@
 	else
 		turn_on(user)
 
+/obj/item/modular_computer/proc/break_apart()
+	visible_message("\The [src] breaks apart!")
+	var/turf/newloc = get_turf(src)
+	new /obj/item/stack/material/steel(newloc, round(steel_sheet_cost/2))
+	for(var/obj/item/weapon/computer_hardware/H in get_all_components())
+		uninstall_component(null, H)
+		H.forceMove(newloc)
+		if(prob(25))
+			H.take_damage(rand(10,30))
+	relay_qdel()
+	qdel()
+
 /obj/item/modular_computer/proc/turn_on(var/mob/user)
 	var/issynth = issilicon(user) // Robots and AIs get different activation messages.
-	if(processor_unit && ((battery_module && battery_module.battery.charge) || check_power_override())) // Battery-run and charged or non-battery but powered by APC.
+	if(damage > broken_damage)
+		if(issynth)
+			user << "You send an activation signal to \the [src], but it responds with an error code. It must be damaged."
+		else
+			user << "You press the power button, but the computer fails to boot up, displaying variety of errors before shutting down again."
+		return
+	if(processor_unit && ((battery_module && battery_module.battery.charge && battery_module.check_functionality()) || check_power_override())) // Battery-run and charged or non-battery but powered by APC.
 		if(issynth)
 			user << "You send an activation signal to \the [src], turning it on"
 		else
@@ -197,6 +256,10 @@
 		last_power_usage = 0
 		return 0
 
+	if(damage > broken_damage)
+		shutdown_computer()
+		return 0
+
 	if(active_program && active_program.requires_ntnet && !get_ntnet_status(active_program.requires_ntnet_feature)) // Active program requires NTNet to run but we've just lost connection. Crash.
 		active_program.event_networkfailure(0)
 
@@ -350,12 +413,13 @@
 		var/mob/user = usr
 		if(hard_drive)
 			P = hard_drive.find_file_by_name(prog)
-			P.computer = src
 
 		if(!P || !istype(P)) // Program not found or it's not executable program.
 			user << "<span class='danger'>\The [src]'s screen shows \"I/O ERROR - Unable to run program\" warning.</span>"
 			return
 
+		P.computer = src
+
 		if(!P.is_supported_by_hardware(hardware_flag, 1, user))
 			return
 
@@ -378,9 +442,9 @@
 		update_uis()
 
 // Used in following function to reduce copypaste
-/obj/item/modular_computer/proc/power_failure()
+/obj/item/modular_computer/proc/power_failure(var/malfunction = 0)
 	if(enabled) // Shut down the computer
-		visible_message("<span class='danger'>\The [src]'s screen flickers \"BATTERY CRITICAL\" warning as it shuts down unexpectedly.</span>")
+		visible_message("<span class='danger'>\The [src]'s screen flickers \"BATTERY [malfunction ? "MALFUNCTION" : "CRITICAL"]\" warning as it shuts down unexpectedly.</span>")
 		if(active_program)
 			active_program.event_powerfailure(0)
 		for(var/datum/computer_file/program/PRG in idle_threads)
@@ -400,6 +464,9 @@
 			power_usage += H.power_usage
 
 	if(battery_module)
+		if(!battery_module.check_functionality())
+			power_failure(1)
+			return
 		battery_module.battery.use(power_usage * CELLRATE)
 
 	last_power_usage = power_usage
@@ -421,10 +488,9 @@
 		user << "You insert \the [I] into \the [src]."
 		return
 	if(istype(W, /obj/item/weapon/paper))
-		var/obj/item/weapon/paper/P = W
 		if(!nano_printer)
 			return
-		nano_printer.load_paper(P)
+		nano_printer.attackby(W, user)
 	if(istype(W, /obj/item/weapon/computer_hardware))
 		var/obj/item/weapon/computer_hardware/C = W
 		if(C.hardware_size <= max_hardware_size)
@@ -441,6 +507,21 @@
 		relay_qdel()
 		qdel(src)
 		return
+	if(istype(W, /obj/item/weapon/weldingtool))
+		var/obj/item/weapon/weldingtool/WT = W
+		if(!WT.isOn())
+			user << "\The [W] is off."
+			return
+
+		if(!damage)
+			user << "\The [src] does not require repairs."
+			return
+
+		user << "You begin repairing damage to \the [src]..."
+		if(WT.remove_fuel(round(damage/75)) && do_after(usr, damage/10))
+			damage = 0
+			user << "You repair \the [src]."
+		return
 
 	if(W.is_screwdriver())
 		var/list/all_components = get_all_components()
@@ -551,13 +632,14 @@
 		found = 1
 		critical = 1
 	if(found)
-		user << "You remove \the [H] from \the [src]."
+		if(user)
+			user << "You remove \the [H] from \the [src]."
 		H.forceMove(get_turf(src))
 		H.holder2 = null
 	if(critical && enabled)
-		user << "<span class='danger'>\The [src]'s screen freezes for few seconds and then displays an \"HARDWARE ERROR: Critical component disconnected. Please verify component connection and reboot the device. If the problem persists contact technical support for assistance.\" warning.</span>"
-		kill_program(1)
-		enabled = 0
+		if(user)
+			user << "<span class='danger'>\The [src]'s screen freezes for few seconds and then displays an \"HARDWARE ERROR: Critical component disconnected. Please verify component connection and reboot the device. If the problem persists contact technical support for assistance.\" warning.</span>"
+		shutdown_computer()
 		update_icon()
 
 
@@ -607,16 +689,16 @@
 		SSnanoui.update_uis(src)
 
 /obj/item/modular_computer/proc/check_update_ui_need()
-	var/ui_updated_needed = 0
+	var/ui_update_needed = 0
 	if(battery_module)
 		var/batery_percent = battery_module.battery.percent()
-		if(last_battery_percent != batery_percent) //Let's update UI on percent chandge
-			ui_updated_needed = 1
+		if(last_battery_percent != batery_percent) //Let's update UI on percent change
+			ui_update_needed = 1
 			last_battery_percent = batery_percent
 
 	if(stationtime2text() != last_world_time)
 		last_world_time = stationtime2text()
-		ui_updated_needed = 1
+		ui_update_needed = 1
 
 	if(idle_threads.len)
 		var/list/current_header_icons = list()
@@ -629,13 +711,51 @@
 
 		else if(!listequal(last_header_icons, current_header_icons))
 			last_header_icons = current_header_icons
-			ui_updated_needed = 1
+			ui_update_needed = 1
 		else
 			for(var/x in last_header_icons|current_header_icons)
 				if(last_header_icons[x]!=current_header_icons[x])
 					last_header_icons = current_header_icons
-					ui_updated_needed = 1
+					ui_update_needed = 1
 					break
 
-	if(ui_updated_needed)
-		update_uis()
\ No newline at end of file
+	if(ui_update_needed)
+		update_uis()
+
+/obj/item/modular_computer/proc/take_damage(var/amount, var/component_probability, var/damage_casing = 1, var/randomize = 1)
+	if(randomize)
+		// 75%-125%, rand() works with integers, apparently.
+		amount *= (rand(75, 125) / 100.0)
+	amount = round(amount)
+	if(damage_casing)
+		damage += amount
+		damage = between(0, damage, max_damage)
+
+	if(component_probability)
+		for(var/obj/item/weapon/computer_hardware/H in get_all_components())
+			if(prob(component_probability))
+				H.take_damage(round(amount / 2))
+
+	if(damage >= max_damage)
+		break_apart()
+
+// Stronger explosions cause serious damage to internal components
+// Minor explosions are mostly mitigitated by casing.
+/obj/item/modular_computer/ex_act(var/severity)
+	take_damage(rand(100,200) / severity, 30 / severity)
+
+// EMPs are similar to explosions, but don't cause physical damage to the casing. Instead they screw up the components
+/obj/item/modular_computer/emp_act(var/severity)
+	take_damage(rand(100,200) / severity, 50 / severity, 0)
+
+// "Stun" weapons can cause minor damage to components (short-circuits?)
+// "Burn" damage is equally strong against internal components and exterior casing
+// "Brute" damage mostly damages the casing.
+/obj/item/modular_computer/bullet_act(var/obj/item/projectile/Proj)
+	switch(Proj.damage_type)
+		if(BRUTE)
+			take_damage(Proj.damage, Proj.damage / 2)
+		if(HALLOSS)
+			take_damage(Proj.damage, Proj.damage / 3, 0)
+		if(BURN)
+			take_damage(Proj.damage, Proj.damage / 1.5) 
\ No newline at end of file
diff --git a/code/modules/modular_computers/computers/item/processor.dm b/code/modules/modular_computers/computers/item/processor.dm
index 26d65bf31a..5e406d048c 100644
--- a/code/modules/modular_computers/computers/item/processor.dm
+++ b/code/modules/modular_computers/computers/item/processor.dm
@@ -11,10 +11,10 @@
 	var/obj/machinery/modular_computer/machinery_computer = null
 
 /obj/item/modular_computer/processor/Destroy()
+	. = ..()
 	if(machinery_computer && (machinery_computer.cpu == src))
 		machinery_computer.cpu = null
 	machinery_computer = null
-	return ..()
 
 // Due to how processes work, we'd receive two process calls - one from machinery type and one from our own type.
 // Since we want this to be in-sync with machinery (as it's hidden type for machinery-based computers) we'll ignore
@@ -25,6 +25,12 @@
 	else
 		return
 
+/obj/item/modular_computer/processor/examine(var/mob/user)
+	if(damage > broken_damage)
+		user << "<span class='danger'>It is heavily damaged!</span>"
+	else if(damage)
+		user << "It is damaged."
+
 // Power interaction is handled by our machinery part, due to machinery having APC connection.
 /obj/item/modular_computer/processor/handle_power()
 	if(machinery_computer)
@@ -40,6 +46,8 @@
 	hardware_flag = machinery_computer.hardware_flag
 	max_hardware_size = machinery_computer.max_hardware_size
 	steel_sheet_cost = machinery_computer.steel_sheet_cost
+	max_damage = machinery_computer._max_damage
+	broken_damage = machinery_computer._break_damage
 
 /obj/item/modular_computer/processor/relay_qdel()
 	qdel(machinery_computer)
@@ -110,7 +118,7 @@
 
 /obj/item/modular_computer/processor/get_all_components()
 	var/list/all_components = ..()
-	if(machinery_computer.tesla_link)
+	if(machinery_computer && machinery_computer.tesla_link)
 		all_components.Add(machinery_computer.tesla_link)
 	return all_components
 
diff --git a/code/modules/modular_computers/computers/item/tablet.dm b/code/modules/modular_computers/computers/item/tablet.dm
index 1c997202db..2154b83e54 100644
--- a/code/modules/modular_computers/computers/item/tablet.dm
+++ b/code/modules/modular_computers/computers/item/tablet.dm
@@ -6,4 +6,5 @@
 	icon_state_menu = "menu"
 	hardware_flag = PROGRAM_TABLET
 	max_hardware_size = 1
-	w_class = 2 
\ No newline at end of file
+	w_class = 2
+	light_strength = 2					// Same as PDAs 
\ No newline at end of file
diff --git a/code/modules/modular_computers/computers/machinery/modular_computer.dm b/code/modules/modular_computers/computers/machinery/modular_computer.dm
index 21f040074e..65e81f0ad6 100644
--- a/code/modules/modular_computers/computers/machinery/modular_computer.dm
+++ b/code/modules/modular_computers/computers/machinery/modular_computer.dm
@@ -20,10 +20,13 @@
 	var/screen_icon_screensaver = "standby"							// Icon state overlay when the computer is powered, but not 'switched on'.
 	var/max_hardware_size = 0										// Maximal hardware size. Currently, tablets have 1, laptops 2 and consoles 3. Limits what hardware types can be installed.
 	var/steel_sheet_cost = 10										// Amount of steel sheets refunded when disassembling an empty frame of this computer.
-
+	var/light_strength = 0											// Light luminosity when turned on
 	var/base_active_power_usage = 100								// Power usage when the computer is open (screen is active) and can be interacted with. Remember hardware can use power too.
 	var/base_idle_power_usage = 10									// Power usage when the computer is idle and screen is off (currently only applies to laptops)
 
+	var/_max_damage = 100
+	var/_break_damage = 50
+
 	var/obj/item/weapon/computer_hardware/tesla_link/tesla_link		// Tesla Link component of this computer. Allows remote charging from nearest APC.
 
 	var/obj/item/modular_computer/processor/cpu = null				// CPU that handles most logic while this type only handles power and other specific things.
@@ -42,7 +45,9 @@
 	if(!cpu || !cpu.enabled)
 		if (!(stat & NOPOWER) || battery_powered)
 			overlays.Add(screen_icon_screensaver)
+		set_light(0)
 		return
+	set_light(light_strength)
 	if(cpu.active_program)
 		overlays.Add(cpu.active_program.program_icon_state ? cpu.active_program.program_icon_state : screen_icon_state_menu)
 	else
@@ -57,15 +62,35 @@
 	if(cpu)
 		cpu.eject_id()
 
+// Eject ID card from computer, if it has ID slot with card inside.
+/obj/machinery/modular_computer/verb/eject_usb()
+	set name = "Eject Portable Device"
+	set category = "Object"
+	set src in view(1)
+
+	if(cpu)
+		cpu.eject_usb()
+
 /obj/machinery/modular_computer/New()
 	..()
 	cpu = new(src)
 
+/obj/machinery/modular_computer/Destroy()
+	if(cpu)
+		qdel(cpu)
+		cpu = null
+	return ..()
+
 // On-click handling. Turns on the computer if it's off and opens the GUI.
 /obj/machinery/modular_computer/attack_hand(mob/user)
 	if(cpu)
 		cpu.attack_self(user) // CPU is an item, that's why we route attack_hand to attack_self
 
+/obj/machinery/modular_computer/examine(var/mob/user)
+	. = ..()
+	if(cpu)
+		cpu.examine(user)
+
 // Process currently calls handle_power(), may be expanded in future if more things are added.
 /obj/machinery/modular_computer/process()
 	if(cpu)
@@ -80,9 +105,9 @@
 	return null
 
 // Used in following function to reduce copypaste
-/obj/machinery/modular_computer/proc/power_failure()
+/obj/machinery/modular_computer/proc/power_failure(var/malfunction = 0)
 	if(cpu && cpu.enabled) // Shut down the computer
-		visible_message("<span class='danger'>\The [src]'s screen flickers [cpu.battery_module ? "\"BATTERY CRITICAL\"" : "\"EXTERNAL POWER LOSS\""] warning as it shuts down unexpectedly.</span>")
+		visible_message("<span class='danger'>\The [src]'s screen flickers [cpu.battery_module ? "\"BATTERY [malfunction ? "MALFUNCTION" : "CRITICAL"]\"" : "\"EXTERNAL POWER LOSS\""] warning as it shuts down unexpectedly.</span>")
 		if(cpu)
 			cpu.shutdown_computer(0)
 		battery_powered = 0
@@ -94,7 +119,7 @@
 	if(cpu.battery_module && cpu.battery_module.battery.charge <= 0) // Battery-run but battery is depleted.
 		power_failure()
 		return 0
-	else if(!cpu.battery_module && (!powered() || !tesla_link || !tesla_link.enabled)) // Not battery run, but lacking APC connection.
+	else if(!cpu.battery_module && (!powered() || !tesla_link || !tesla_link.enabled || !tesla_link.check_functionality())) // Not battery run, but lacking APC connection.
 		power_failure()
 		return 0
 	else if(stat & NOPOWER)
@@ -111,7 +136,7 @@
 			power_usage += CH.power_usage
 
 	// Wireless APC connection exists.
-	if(tesla_link && tesla_link.enabled)
+	if(tesla_link && tesla_link.enabled && tesla_link.check_functionality())
 		idle_power_usage = power_usage
 		active_power_usage = idle_power_usage + 100 	// APCLink only charges at 100W rate, but covers any power usage.
 		use_power = 1
@@ -127,6 +152,9 @@
 	else	// No wireless connection run only on battery.
 		use_power = 0
 		if (cpu.battery_module)
+			if(!cpu.battery_module.check_functionality())
+				power_failure(1)
+				return
 			cpu.battery_module.battery.use(power_usage * CELLRATE)
 	cpu.last_power_usage = power_usage
 
@@ -141,4 +169,25 @@
 /obj/machinery/modular_computer/attackby(var/obj/item/weapon/W as obj, var/mob/user as mob)
 	if(cpu)
 		return cpu.attackby(W, user)
-	return ..()
\ No newline at end of file
+	return ..()
+
+
+// Stronger explosions cause serious damage to internal components
+// Minor explosions are mostly mitigitated by casing.
+/obj/machinery/modular_computer/ex_act(var/severity)
+	if(cpu)
+		cpu.ex_act(severity)
+
+// EMPs are similar to explosions, but don't cause physical damage to the casing. Instead they screw up the components
+/obj/machinery/modular_computer/emp_act(var/severity)
+	if(cpu)
+		cpu.emp_act(severity)
+
+// "Stun" weapons can cause minor damage to components (short-circuits?)
+// "Burn" damage is equally strong against internal components and exterior casing
+// "Brute" damage mostly damages the casing.
+/obj/machinery/modular_computer/bullet_act(var/obj/item/projectile/Proj)
+	if(cpu)
+		cpu.bullet_act(Proj)
+
+
diff --git a/code/modules/modular_computers/computers/machinery/modular_console.dm b/code/modules/modular_computers/computers/machinery/modular_console.dm
index 879b675c1f..9919df7820 100644
--- a/code/modules/modular_computers/computers/machinery/modular_console.dm
+++ b/code/modules/modular_computers/computers/machinery/modular_console.dm
@@ -14,6 +14,9 @@
 	base_active_power_usage = 500
 	max_hardware_size = 3
 	steel_sheet_cost = 20
+	light_strength = 4
+	_max_damage = 300
+	_break_damage = 150
 
 /obj/machinery/modular_computer/console/buildable/New()
 	..()
diff --git a/code/modules/modular_computers/computers/machinery/modular_laptop.dm b/code/modules/modular_computers/computers/machinery/modular_laptop.dm
index ff2e851dc6..bce2d5192d 100644
--- a/code/modules/modular_computers/computers/machinery/modular_laptop.dm
+++ b/code/modules/modular_computers/computers/machinery/modular_laptop.dm
@@ -60,6 +60,9 @@
 	base_idle_power_usage = 25
 	base_active_power_usage = 200
 	max_hardware_size = 2
+	light_strength = 3
+	_max_damage = 200
+	_break_damage = 100
 
 /obj/machinery/modular_computer/laptop/buildable/New()
 	..()
diff --git a/code/modules/modular_computers/hardware/battery_module.dm b/code/modules/modular_computers/hardware/battery_module.dm
index ae685c4b37..1443059868 100644
--- a/code/modules/modular_computers/hardware/battery_module.dm
+++ b/code/modules/modular_computers/hardware/battery_module.dm
@@ -5,7 +5,7 @@
 	desc = "A standard power cell, commonly seen in high-end portable microcomputers or low-end laptops. It's rating is 750."
 	icon_state = "battery_normal"
 	critical = 1
-
+	malfunction_probability = 1
 	var/battery_rating = 750
 	var/obj/item/weapon/cell/battery = null
 
@@ -50,7 +50,9 @@
 	hardware_size = 1
 	battery_rating = 1000000
 
-
+/obj/item/weapon/computer_hardware/battery_module/diagnostics(var/mob/user)
+	..()
+	user << "Internal battery charge: [battery.charge]/[battery.maxcharge] CU"
 
 /obj/item/weapon/computer_hardware/battery_module/New()
 	battery = new/obj/item/weapon/cell(src)
diff --git a/code/modules/modular_computers/hardware/hard_drive.dm b/code/modules/modular_computers/hardware/hard_drive.dm
index e595c56800..8dbf4e5be0 100644
--- a/code/modules/modular_computers/hardware/hard_drive.dm
+++ b/code/modules/modular_computers/hardware/hard_drive.dm
@@ -49,6 +49,12 @@
 	icon_state = "hdd_micro"
 	hardware_size = 1
 
+/obj/item/weapon/computer_hardware/hard_drive/diagnostics(var/mob/user)
+	..()
+	// 999 is a byond limit that is in place. It's unlikely someone will reach that many files anyway, since you would sooner run out of space.
+	user << "NT-NFS File Table Status: [stored_files.len]/999"
+	user << "Storage capacity: [used_capacity]/[max_capacity]GQ"
+
 // Use this proc to add file to the drive. Returns 1 on success and 0 on failure. Contains necessary sanity checks.
 /obj/item/weapon/computer_hardware/hard_drive/proc/store_file(var/datum/computer_file/F)
 	if(!F || !istype(F))
@@ -57,6 +63,9 @@
 	if(!can_store_file(F.size))
 		return 0
 
+	if(!check_functionality())
+		return 0
+
 	if(!stored_files)
 		return 0
 
@@ -84,6 +93,9 @@
 	if(!stored_files)
 		return 0
 
+	if(!check_functionality())
+		return 0
+
 	if(F in stored_files)
 		stored_files -= F
 		recalculate_size()
@@ -124,6 +136,9 @@
 
 // Tries to find the file by filename. Returns null on failure
 /obj/item/weapon/computer_hardware/hard_drive/proc/find_file_by_name(var/filename)
+	if(!check_functionality())
+		return null
+
 	if(!filename)
 		return null
 
diff --git a/code/modules/modular_computers/hardware/hardware.dm b/code/modules/modular_computers/hardware/hardware.dm
index 580d73745b..43c7dbc4dc 100644
--- a/code/modules/modular_computers/hardware/hardware.dm
+++ b/code/modules/modular_computers/hardware/hardware.dm
@@ -3,12 +3,51 @@
 	desc = "Unknown Hardware"
 	icon = 'icons/obj/modular_components.dmi'
 	var/obj/item/modular_computer/holder2 = null
-	var/power_usage = 0 	// If the hardware uses extra power, change this.
-	var/enabled = 1			// If the hardware is turned off set this to 0.
-	var/critical = 1		// Prevent disabling for important component, like the HDD.
-	var/hardware_size = 1	// Limits which devices can contain this component. 1: Tablets/Laptops/Consoles, 2: Laptops/Consoles, 3: Consoles only
+	var/power_usage = 0 			// If the hardware uses extra power, change this.
+	var/enabled = 1					// If the hardware is turned off set this to 0.
+	var/critical = 1				// Prevent disabling for important component, like the HDD.
+	var/hardware_size = 1			// Limits which devices can contain this component. 1: Tablets/Laptops/Consoles, 2: Laptops/Consoles, 3: Consoles only
+	var/damage = 0					// Current damage level
+	var/max_damage = 100			// Maximal damage level.
+	var/damage_malfunction = 20		// "Malfunction" threshold. When damage exceeds this value the hardware piece will semi-randomly fail and do !!FUN!! things
+	var/damage_failure = 50			// "Failure" threshold. When damage exceeds this value the hardware piece will not work at all.
+	var/malfunction_probability = 10// Chance of malfunction when the component is damaged
+
+/obj/item/weapon/computer_hardware/attackby(var/obj/item/W as obj, var/mob/living/user as mob)
+	// Multitool. Runs diagnostics
+	if(istype(W, /obj/item/device/multitool))
+		user << "***** DIAGNOSTICS REPORT *****"
+		diagnostics(user)
+		user << "******************************"
+		return 1
+	// Nanopaste. Repair all damage if present for a single unit.
+	var/obj/item/stack/S = W
+	if(istype(S, /obj/item/stack/nanopaste))
+		if(!damage)
+			user << "\The [src] doesn't seem to require repairs."
+			return 1
+		if(S.use(1))
+			user << "You apply a bit of \the [W] to \the [src]. It immediately repairs all damage."
+			damage = 0
+		return 1
+	// Cable coil. Works as repair method, but will probably require multiple applications and more cable.
+	if(istype(S, /obj/item/stack/cable_coil))
+		if(!damage)
+			user << "\The [src] doesn't seem to require repairs."
+			return 1
+		if(S.use(1))
+			user << "You patch up \the [src] with a bit of \the [W]."
+			take_damage(-10)
+		return 1
+	return ..()
+
+
+// Called on multitool click, prints diagnostic information to the user.
+/obj/item/weapon/computer_hardware/proc/diagnostics(var/mob/user)
+	user << "Hardware Integrity Test... (Corruption: [damage]/[max_damage]) [damage > damage_failure ? "FAIL" : damage > damage_malfunction ? "WARN" : "PASS"]"
 
 /obj/item/weapon/computer_hardware/New(var/obj/L)
+	w_class = hardware_size
 	if(istype(L, /obj/machinery/modular_computer))
 		var/obj/machinery/modular_computer/C = L
 		if(C.cpu)
@@ -20,4 +59,30 @@
 
 /obj/item/weapon/computer_hardware/Destroy()
 	holder2 = null
-	..() 
\ No newline at end of file
+	return ..()
+
+// Handles damage checks
+/obj/item/weapon/computer_hardware/proc/check_functionality()
+	// Too damaged to work at all.
+	if(damage > damage_failure)
+		return 0
+	// Still working. Well, sometimes...
+	if(damage > damage_malfunction)
+		if(prob(malfunction_probability))
+			return 0
+	// Good to go.
+	return 1
+
+/obj/item/weapon/computer_hardware/examine(var/mob/user)
+	. = ..()
+	if(damage > damage_failure)
+		user << "<span class='danger'>It seems to be severely damaged!</span>"
+	else if(damage > damage_malfunction)
+		user << "<span class='notice'>It seems to be damaged!</span>"
+	else if(damage)
+		user << "It seems to be slightly damaged."
+
+// Damages the component. Contains necessary checks. Negative damage "heals" the component.
+/obj/item/weapon/computer_hardware/proc/take_damage(var/amount)
+	damage += round(amount) 					// We want nice rounded numbers here.
+	damage = between(0, damage, max_damage)		// Clamp the value.
diff --git a/code/modules/modular_computers/hardware/nano_printer.dm b/code/modules/modular_computers/hardware/nano_printer.dm
index 000c1c0981..11caa79794 100644
--- a/code/modules/modular_computers/hardware/nano_printer.dm
+++ b/code/modules/modular_computers/hardware/nano_printer.dm
@@ -1,27 +1,32 @@
 /obj/item/weapon/computer_hardware/nano_printer
 	name = "nano printer"
-	desc = "Small integrated printer with scanner and paper recycling module."
+	desc = "Small integrated printer with paper recycling module."
 	power_usage = 50
 	critical = 0
 	icon_state = "printer"
 	hardware_size = 1
 	var/stored_paper = 5
 	var/max_paper = 10
-	var/obj/item/weapon/paper/P = null	// Currently stored paper for scanning.
 
+/obj/item/weapon/computer_hardware/nano_printer/diagnostics(var/mob/user)
+	..()
+	user << "Paper buffer level: [stored_paper]/[max_paper]"
 
 /obj/item/weapon/computer_hardware/nano_printer/proc/print_text(var/text_to_print, var/paper_title = null)
 	if(!stored_paper)
 		return 0
+	if(!enabled)
+		return 0
+	if(!check_functionality())
+		return 0
 
-	// Recycle stored paper
-	if(P)
-		stored_paper++
-		qdel(P)
-		P = null
+	var/obj/item/weapon/paper/P = new/obj/item/weapon/paper(get_turf(holder2))
 
-	P = new/obj/item/weapon/paper(get_turf(holder2))
-	P.info = text_to_print
+	// Damaged printer causes the resulting paper to be somewhat harder to read.
+	if(damage > damage_malfunction)
+		P.info = stars(text_to_print, 100-malfunction_probability)
+	else
+		P.info = text_to_print
 	if(paper_title)
 		P.name = paper_title
 	P.update_icon()
@@ -29,34 +34,18 @@
 	P = null
 	return 1
 
-/obj/item/weapon/computer_hardware/nano_printer/proc/load_paper(var/obj/item/weapon/paper/paper)
-	if(!paper || !istype(paper))
-		return 0
+/obj/item/weapon/computer_hardware/nano_printer/attackby(obj/item/W as obj, mob/user as mob)
+	if(istype(W, /obj/item/weapon/paper))
+		if(stored_paper >= max_paper)
+			user << "You try to add \the [W] into [src], but it's paper bin is full"
+			return
 
-	// We already have paper loaded, recycle it.
-	if(P && try_recycle_paper())
-		P = paper
-		P.forceMove(holder2)
-
-/obj/item/weapon/computer_hardware/nano_printer/proc/try_recycle_paper()
-	if(!P)
-		return 0
-
-	if(stored_paper >= max_paper)
-		return 0
-
-	qdel(P)
-	P = null
-	return 1
+		user << "You insert \the [W] into [src]."
+		qdel(W)
+		stored_paper++
 
 /obj/item/weapon/computer_hardware/nano_printer/Destroy()
 	if(holder2 && (holder2.nano_printer == src))
 		holder2.nano_printer = null
-	if(P)
-		if(holder2)
-			P.forceMove(get_turf(holder2))
-		else
-			qdel(P)
-		P = null
 	holder2 = null
 	..() 
\ No newline at end of file
diff --git a/code/modules/modular_computers/hardware/network_card.dm b/code/modules/modular_computers/hardware/network_card.dm
index 1640105865..247508806e 100644
--- a/code/modules/modular_computers/hardware/network_card.dm
+++ b/code/modules/modular_computers/hardware/network_card.dm
@@ -11,6 +11,18 @@ var/global/ntnet_card_uid = 1
 	var/identification_string = "" 	// Identification string, technically nickname seen in the network. Can be set by user.
 	var/long_range = 0
 	var/ethernet = 0 // Hard-wired, therefore always on, ignores NTNet wireless checks.
+	malfunction_probability = 1
+
+/obj/item/weapon/computer_hardware/network_card/diagnostics(var/mob/user)
+	..()
+	user << "NIX Unique ID: [identification_id]"
+	user << "NIX User Tag: [identification_string]"
+	user << "Supported protocols:"
+	user << "511.m SFS (Subspace) - Standard Frequency Spread"
+	if(long_range)
+		user << "511.n WFS/HB (Subspace) - Wide Frequency Spread/High Bandiwdth"
+	if(ethernet)
+		user << "OpenEth (Physical Connection) - Physical network connection port"
 
 /obj/item/weapon/computer_hardware/network_card/New(var/l)
 	..(l)
@@ -27,7 +39,7 @@ var/global/ntnet_card_uid = 1
 
 /obj/item/weapon/computer_hardware/network_card/wired
 	name = "wired NTNet network card"
-	desc = "An advanced network card for usage with NTNet. This one uses wired connection."
+	desc = "An advanced network card for usage with standard NTNet frequencies. This one also supports wired connection."
 	ethernet = 1
 	power_usage = 100 // Better range but higher power usage.
 	icon_state = "netcard_ethernet"
@@ -51,6 +63,9 @@ var/global/ntnet_card_uid = 1
 	if(!enabled)
 		return 0
 
+	if(!check_functionality())
+		return 0
+
 	if(ethernet) // Computer is connected via wired connection.
 		return 3
 
@@ -60,7 +75,11 @@ var/global/ntnet_card_uid = 1
 	if(holder2)
 		var/turf/T = get_turf(holder2)
 		if((T && istype(T)) && T.z in using_map.station_levels)
-			return 2
+			// Computer is on station. Low/High signal depending on what type of network card you have
+			if(long_range)
+				return 2
+			else
+				return 1
 
 	if(long_range) // Computer is not on station, but it has upgraded network card. Low signal.
 		return 1
diff --git a/code/modules/modular_computers/hardware/processor_unit.dm b/code/modules/modular_computers/hardware/processor_unit.dm
index c258a3e5aa..fdaf216298 100644
--- a/code/modules/modular_computers/hardware/processor_unit.dm
+++ b/code/modules/modular_computers/hardware/processor_unit.dm
@@ -8,6 +8,7 @@
 	hardware_size = 2
 	power_usage = 50
 	critical = 1
+	malfunction_probability = 1
 
 	var/max_idle_programs = 2 // 2 idle, + 1 active = 3 as said in description.