I built my own system from scratch about 18months ago and have been adding little bits here and their as different hardware becomes available in my price range. My current spec is:
Asus Crosshair NF590 motherboard
AMD X2 Dual Core AM2 Athlon 64 5200
4 gigs of Corsair XMS6400
800W power supply
I have had absolutely no problem with this setup for the whole time I have been using it until now. I have recently purchased Left 4 dead and every time I play it I get about 10-15 mins into it (usually during scenes of intense combat) and the computer just shuts down. It’s like someone has hit the power switch at the wall, No blue screen of death, no crashing sounds, just off. There is still power to the computer (all the LED lights are on) but my motherboard will not turn on again saying CPU INIT on the LCD display, until I turn the power off completely at the wall.
Could this be a hardware fault or should I perhaps try to update my bios? I have the latest graphics drivers.