System specifications:

Motherboard: Gigabyte GA-7n400 pro2 rev 1.x
CPU: AMD Athlon XP 2600+ 1920 MHz (Barton)
Memory: 2x512 Kingmax Tiny BGA
HDD: Maxtor ATA 133 7200 rpm
Video: Asus ATI Radeon 9600 XT 128 MB
Audio: C-Media CMI8738 PCI
Onboard LAN: Realtek 8169
LAN: Surecom EP-320X-S PCI


I have the following problem:

When i run a game, after some time the display screen turns black and the computer shuts down.

I belive its a driver conflict or a driver problem.
I use the nvidia chipset drivers for GA-7n400 pro2 from the gigabyte website.
The video driver is a tweaked one called Omega Radeon Driver, because the ATI drivers are very unstable.

If you could offer some suggestions i gladly expect them.
I hope i will solve this problem because its very annoying.
Thanks