You know, if you want to bump, at least start with the results of the reasearch you did in the last few days. Or did you just wait around hoping someone will fix your PC from the big distance through a forum?
What happend when you tried the card in another computer?
Where did the system specs disappear from your OP?
Was the motherboard BIOS update successful?
What did <whatevercompanythatmadeyourmotherboard> say when you contacted their support department?
What happened when you disabled power saving features, made the clock speeds constant etc.?
What happened in the temp OS you installed for troubleshooting?
How did the system react to a linux live CD?
What else did you experiment?
Don't wait for questions. You alre allowed to write your findings first.
CPU: AMD Phenom II X4 810 @ 3250MHz | RAM: Kingmax 2x2GB DDR2 800 @ 833MHz| MoBo: MSI K9A2 CF v1.0 (BIOS: 1.D)| GPU: Asus HD 6850 1024MB (DirectCu) @ 850/1150MHz | Display: L24FHD | PSU: PC Power & Cooling Silencer 750 Quad | OS: MS Windows 7 Pro x64
CPU: Pentium 4 Northwood S478 @ 3200MHz | RAM: 1,5GB DDR 400| MoBo: Gigabyte GA-8S661FXMP-RZ | GPU: ASUS Radeon X1650 Pro 256MB | Display: Dimarson 19" CRT | PSU: Noname 400W | OS: changing twice every week...