One day after switching my PC off by holding down the power button the monitor can no longer detect any signals from my PC. The monitor displays nothing except a message stating "No Input Signal". I got a new monitor and it displays "No Signal Detected". I have checked the graphics card and it is displaying a green light indicating that it is still functional. When I swap in another graphics card from a working PC the monitor still detects nothing. I have also tested the card in all of the other available slots. Furthermore I have tested the 2 Ram cards seperately in every slot with no success. There has been no funny burning smells from the computer or any indication that something isnt working. I have also tested three types of Monitor-PC cable: DVDI-D (dual link), DVI-D (single link) and VGA to DVI-A. I have tested it on a monitor which functions properly with other computers connected. I have tried clearing the CMOS between tests too. The whole computer has been vacuumed and also the plugs after some dust build-up so I am left to believe it is a motherboard malfunction due to some dust having caused a short-circuit or more likely a power surge as I dont have a surge protector installed. Computer Hardware: MONITOR = BenQ G2220HD CPU = Intel Core i7-920 @ 2.67Ghz GPU = Gygabite Nvidia Geforce GTX 280 MOBO = Gygabite-GA-EX58-UD5 RAM = CORSAIR XMS3 DHX 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Dual Channel Kit PSU = Hyper Blue 850w 85% Efficiency SLI Ready O/S = Windows Vista 32bit I would like to know is there anything left to test? or is there any way to know for certain if it is a motherboard issue (since all components seem to be working)?.... things are looking grim as i can't find my receipt for the hardware and the pc has ran extensively for 1year.