Re: Gainward 7900gs problems
The symptoms you report often are the result of the gfx memory chip/s failing, not a lot you can do.
Have you removed the card from its slot? it's possible that vibration, over time, could have dislodged the card, and reseating it should solve this problem. While you have the card out, check for dirty conectors (on both the card and the pci-e slot), if any appear dis-coloured/dirty, gently rub them clean with an eraser on a pencil.
Hope this helps, but if it is the first prob. I mentioned then the rma process is really the only way to go.
Re: Gainward 7900gs problems
I tried reseating the card several times, the thing is in imaculate condition, barely a spec of dust on it (thanks no doubt to my home made dust filters, the gf though I was a bit strange buying tights, but they work)