Computer switches off when playing games!

[Xigna]

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Ok, so heres the problem! I try and play any game such as Tomb-Raider Legend or any Steam based game like Counter Strike and my pc screen goes blank (like it goes into standby or something, the computer is still on and sound loops)! I then have to manually power off and restart and everythings fine until i come to play again and the same happens. My pc specs are:

Foxconn/Winfast 760GXK8MC/R-S Motherboard
Amd Semperon 2600+
NVidia Ge-Force4 Ti 4200 AGP8x (Has fan and everything)
320W PSU (dont know make but good PSU)
768MB Ram (Lol)
40GB HDD 7200RPM

I think that would be all you need and here are the temperatures + speeds i recorded:

Motherboard : 38 C
CPU : 37 C
Power : 30 C
HDD : 40 C
Chassis Cooling fan : 2909 RPM
CPU : 4000 RPM

Here are voltages :

+12V : 11.97V
+5v : 4.81V
Core : +1.38V
+3.3v : 3.17V
AUX : +2.67V

Graphics temps and rpms:

Fan Speed : 5000RPM
GPU : 51 C
Ambient : 51 C

Voltages

Core +2.47V
Bus : +3.31V

Right so i recon thats all, i made this computer myself by the way so...

Also, i have latest chipset drivers, graphics card drivers and DirectX 9.0c. I have scouted the internet trying to find some awnsers and have come out blank. This is all i can think of doing so any help would be appriciated.

Oh and im on Windows Media center Edition 2005 , have tried it on vista and bog standard xp and it does the same

Please help!

Xigna

[Xigna]

Right, the case is a brand new case with like air slots all over so i dont think that it could overheat too easily. The PSU is: FSP Group INC - FSP300-60PN.

Thanks, Xigna.

[Kevin_gibson]

Xigna.

Would this make the screen go blank on HIGH powered games only?
I.e. Games with a lot of colour, graphics, action etc.

Might be your graphics card to be totally honest with you, or RAM..

Download a RAM checker from Microsoft.

http://oca.microsoft.com/en/windiag.asp

Also run dxdiag to check out your VGA card.

I feel its your card locking up.

Have it swap tested if possible.