First he thought that it was the drivers that wasn't right so he chose to uninstall the drivers that came with the graphics card and installed the latest Nivida drivers. This didn't help.
He then checked the cooling of the graphics card to see if this was the problem, but Nividas own program told him that the temprature didn't increase paticulary much during the stress test.
Now he is starting to think that the card might be defect, and that it is therefore a hardware problem which is covered by the warranty. But before he choses to send the card back he want to here if someone here has any solution or thoughts about the problem.
His system is as followed:
Chassi - Antec Lifestyle Sonata III med 500W nätagg
Motherboard - Gigabyte GA-P35-DS3 (rev 2.1)
Processor - Inter core 2 duo E6550 2.33 GHz 4 MB
Memory - Corsair XMS2 - 6400 Twin ... Xtreme 2 x2048.
Harddrive - Western Digital Caviar 250Gig
Graphic card - XFX Geforce 8800GT 512MB
He is running Windows XP 32-bits (Yes, all of the memory isn't used in XP 32-bit but it's just until he is able to purchuse a Vista 64-bit copy)