Random Reboots

Hello All,

My problem is that during gaming my computer will reboot itself and most recently it has even done this from the desktop while downloading a game. At first I thought it may be due to old graphics cards so I bought a XFX Geforce 275 GTX to replace my old Radeon HD 2600 XT's (crossfired). No luck in fixing my problem (all drivers were up to date). Currently I am running on Windows 7 OS. As of now here are the specs:

CPU - AMD Phenom 9500 (2.2GHz)
Video - Geforce 275 GTX
Mother - Asus M3A32-MVP Deluxe/WiFi-AP
Power - X3 800W
RAM - 2gb Kingston
HD - 400GB Seagate

My uncle tried pagefiling to borrow some memory from the HD to assist the RAM but this did not help. Next I am thinking to buy new RAM just because 2b is kinda weak and I would feel a bit better with at least 4gb. Any ideas on what the problem could be?

Thanks.

There is no blue screen before the reboot - it just reboots... Monitor goes black, machine lets out a beep and starts running again. I am not currently overclocking my cpu (though I have heard that overclocking amd phenom 9500 doesnt yield good results...).

hear the beep, and check in the board manual. some manufacturers use sound beeps to help diagnose a problem. also check if the board has a led-diagnostic display.

TEST YOUR HARDWARE

Since it started when you installed the Geforce 275 GTX I would put the old card back in for a while just to check, if that works it doesn't mean it's the GPU, it could be the PSU that's dodgy and not providing enough power, but it gets you slightly closer to an answer.

Also, although not the cause of the problem, I would upgrade to 4GB of RAM.