Guys, I have two GeForce GT 6800 from XFX (Green model). One of them, on my stone-age PC isn't recognized neither by the BIOS nor by Windows. On my relatively-ontime PC, it gives a POST error. The second one is usable on both systems but it has a stuffload of random lines everywhere from boot to desktop. I got these from a PC shop that needed to make room. I was warned that they were sitting on the shelf for quite some time. Is it possible to revive one of them?
Also note that the one that shows random lines, it stopped showing them when I got to the desktop on first install. When I updated the graphics drivers, it began giving a bluescreen while booting Windows but it booted to safemode without an issue. (And with those lines again)