I have an older socket 478 Asus mobo with a 2.6ghz P4, 2 gigs OCZ Ram, 19 Viewsonic CRT, Creative Audigy 2 ZS, 19 Viewsonic CRT & a Ati X850 Pro. Recently I flashed my X850 pro with a modified bios to unlock 4 of it's pixel pipes. This seemed to work flawlessly for a while and increased performance. I used ATi Tool shortly afterward to see how far it would overclock using the 'find max overclock' option. It got up to 528 mhz & 98 degrees celsius before causing a hard reboot.
These insane temps were only sustained for a very brief period of time, so I didn't think anything of it. Unfortunately, my system started locking up very frequently shortly afterward. I flashed back to the original BIOS which didn't seem to matter. I figured that I most likely damaged the card at this point, but decided to reinstall XP to rule out any other possibility.
I decided to do an OS upgrade reinstall instead of a full reinstall. However, Windows was having a problem copying over multiples files in the middle of it, so I was forced to attempt a full reinstall. Before I even had the chance, the graphics card started causing extreme artifacting on the BIOS startup screen after I rebooted, so I shutdown.
When I booted it back up, it took a while before a picture would even appear on screen. It looked normal for a few seconds and then begun artifcating again. In addition to this, the monitor would kick off intermittenly. And when it came back on, it caused the system to reboot. I can't even get to the Windows reinstall screen before these problems kick in.
I tried throwing in my spare AGP Nvidia FX5200, and it wouldn't even display a picture. I purchased an Radeon 3850 as a replacement, and it fails to display a picture as well. Strangely enough, my X850 pro is the only graphics card that will display a picture. Do you think I've damaged the AGP slot or possibly the entire motherboard?