Build up PC keeps crashing!

[Rogel]

Hello all I build up a pc from scratch, the problem is it keeps crushing and freezing. I reformat and installed the OS more than twice first time was win 7 than xp. I also took all the parts off and put back again. The original power supply was 500w, now I installed a 1000w and keps crushing. the computer crash often when it runs a game like MW2 or starcraft

 

system specifications.

 

Graphic card: BG Tech Gforce 250 1GB

Processor: Intel Quad 2.4GHz

Ram: 4 Gb DDR2

Motherboard: Asus P5Q Pro Turbo

Power supply: 1000 W

Cooler Master Fan

HDD: Seagate Barracuda 160 GB 7200 rpm.

 

Any advice I will appreciate, I tried differents approachs and couldn't fixed

[KenB]

Hi and welcome to ExTS

 

switch off at the wall but leave the plug in to maintain the earth connection to the m/board.

 

Disconnect all external hardware ( monitor / printer etc )

 

Take all removable cards ( RAM / Video etc ) off the motherboard

 

Take the power connections off the drives.

 

Disconnect the drive data cables at the m/board.

 

leave only the 20(4) way cable from the PSU attached,

 

Switch on.

 

You should get POST beeps if you have an internal speaker connected.

 

No POST beeps indicates a PSU or m/board problem.

If it isn't stable - fans spinning / LEDs on / no crash / or reboot then you have a m/board or PSU problem.