Made computers slightly backlit.

code/game/machinery/computer/computer.dm

@@ -8,6 +8,7 @@
 	active_power_usage = 300
 	var/obj/item/weapon/circuitboard/circuit = null //if circuit==null, computer can't disassembly
 	var/processing = 0
+	luminosity = 2
 
 /obj/machinery/computer/New()
 	..()
@@ -20,7 +21,9 @@
 
 /obj/machinery/computer/process()
 	if(stat & (NOPOWER|BROKEN))
+		luminosity = 0
 		return 0
+	luminosity = 2
 	return 1
 
 /obj/machinery/computer/meteorhit(var/obj/O as obj)

code/game/machinery/computer/power.dm

@@ -10,6 +10,7 @@
 	use_power = 2
 	idle_power_usage = 20
 	active_power_usage = 80
+	luminosity = 2
 
 //fix for issue 521, by QualityVan.
 //someone should really look into why circuits have a powernet var, it's several kinds of retarded.