PC build keeps randomly crashing

[liam72uk]

Hi guys I have just built the following system for a friend

Intel E5200
Gigabyte GA-P35-S3G
Corsair XMS2 4GB DDR2
Radeon HD 3850
OCZ Stealth Stream 600W
160GB Sata HD

The problem is it keeps kicking me out of games and then sometimes it just turns off.
There looks to be nothing overheating and I have tested the ram with memtest and it completed a test 100%. I have also updated the motherboard bios.

Can you make any suggestions as to what is wrong?

Thanks

 

[J.B]

If your sure nothing is overheating the only thing I could suggest is try new drivers, especially for the graphics.

I would have said memory or heat though.

 

[Happy]

PSU? If it keeps shutting down. I had an Coolermaster I-Green 600W that couldn't power an X1950XTX, even though it should be able to easily. Just whacked my testing PSU (HX520) into the same setup and all is well

 

[liam72uk]

I have installed all the latest drivers and tried diffrerent ones. I have also tried a 450W antec powerpack and that did not solve the problem either.

Sometimes the pc can restart itself as soon as I have turned it on?????