I've got a 256MB Leadtek 6800nu that just started getting major screen corruptions today. I'll try and get a pic but its similar to what happened with older monitors if you tried to stick the res too high. It happens in the BIOS aswell and the card isnt OC'ed. edited for spelling and punctuation - bigz
I'd also look over the card to see if anything has fallen off (small capacitors etc.), it happened to my old TNT2 and I had similar screen corruptions.
the temp are normal (measuring with a temp diode on back of card) will have a look to see if anything has fallen off
well looks likes its dieing. anyone got suggestions on cutting the core out and turning it into a keyring