HELP NEEDED !!! Vga displaying weird artifacts

Hi guys,
am having some strange problems with my vga 8800 ultra.
it was working fine yesterday but today when i started my pc it starter showing weird artifacts from boot menu. i have attached a picture to give u an idea.
At first windows refuse to start, then i started in safe mode and all went well but artifacts were still there. i tried unistalling the drivers that helped and windows started normally plus the artifacts i also tried switching memory modules and tried booting with minimum hardware but no luck.
I have never overclocked my pc but the vga i got is factory overclocked. i havnt installed any software recently.
Any sort of help would be greatly appreciated.

hey thx for the quick reply.
i tried riva tuner but itz not showing any temp reading. all other like core clock are ok but no temp

ok i tried gup-z and it worked. here are the readings.
gpu temp=59C
pcb temp=56
hope this helps

i have a problem too with artifact for first time plug 6800gt pcie in to my abit an78hd. As i know from my experiment every vga i' ve tested from geforce 4series to geforce 7 series, the problem the artifacts, first from bad fabricating, and 2nd from psu. From fabricating it's difficult to repair or mostly never ever and forever be repair. 2nd you can try to reflash vga bios and ,minimize clock speed of gpu and gddr memory. Try to flash bios with lower tweak bios may it could help.. Hope your card back to where it started.. That's it's..

Hos the fan working on the GPU? Are you able to see that it can go from 40%to 100%?