FarCry2 no signal input error

Hi guys,

Well I've recently upgraded my graphics card and psu and my specs now are as follows:
Mobo: Asus M2N motherboard
Cpu: AMD 3600+ x2 @ 1.9ghz (stock)
Ram: 2x Transcend 1gb DDR2 800mhz
gpu: Galaxy gforce 9800gt 512ddr3
psu: 520watt Corsair HX520
HDD: 1x 160gb sata Western digital, 1x 160gb sata2 Seagate

The problem is that when I play FarCry2 for a certain amount of time (anything from 5 to 40mins) I will eventually get looping sound and my screen will get a no signal input and shut down. The only way to get out of it is to force restart. Now I would say that this would be an overheating problem, but I can play Crysis on high and Fallout 3 on high for hours and get no crashes what-so-ever. I have read around and done research before coming here, and the only thing that have been offered up as a problem is that of my on board sound, bad programming on Ubisoft's part or glitchy Nvidia drivers.

I have reformatted my computer, reinstalled drivers, use service pack 3, revert back to service pack 2, used new gpu drivers, revert back to disc drivers....etc

To no avail....

Im not very computer savvy, but I will try to take in any advice.
Thanks.

well, i suggest using some software to record CPU/GPU/RAM working status, with that record you can figure out whether it's overheat really simple.

also, try using other graphic card temporary instead of yours can help figuring things out.