Thread: Why is my computer crashing?

I just reformatted my computer from windows 7 ultimate to windows 7 ultimate genuine yesterday and since then my computer has been crashing. so far 7 times already mostly during game. One time it crashed while trying to turn on but other 6 times crashed during game. It was perfectly fine before i reformatted. Nothing shows up just turns off and turns back on immediately. Any body knows why or what can i do to fix it?
Its a costume built Intel(R) core (TM)2 Quad CPU q9300 @ 2.5GHz. 8 GB of RAM. 64 bit. Graphic card: Geforce GTX 260.

Ok a few things i need to know more about. What bit is the OS? (32-bit, 64-bit) If it is 64-bit, is your CPU compatible? Was Win7 Ultimate running as 32-bit or 64-bit? Did you try any windows updates? Did you update your video drivers? And last but not least, did you try taking out memory sticks to see if they are at fault? Sometimes i've had that problem even if they were working fine with another version of a OS.

64-bit, my CPU is compatible. Windows 7 ultimate was running as 64-bit. I think by now all the windows updates has run automatically while shutting down if that's what you are talking about. haven't done anything extra. I only downloaded my graphics card driver. I ran the Ram test but no problems were there. Thanks alot for trying to help.

I would get memtest and test your memory and also check your hard drives. Check the temp on the GTX 260 too as I have issues with mine overheating and I have to use ntune to manually set the fan to 100% while gaming.