I'm having weird issues with my Asrock 775VSTA board. I had put together a budget rig to use with Vista Ultimate 64 and was initially using a 6800 PCIe card. Once I got to the desktop, all icons/background were gone and the context menus were black, so I booted to safe mode and loaded the newest Nvidia driver for the card (169.25). Same thing after a reboot, so I pulled the 6800 and used a 7900GS card, which fixed my black screen issues. But as soon as I tried to run the Performance Index test, a kindly Nvidia popup informed me that I had forgotten to plug the PCIe power plug in .. DOH !!! Stupid, WT .. stupid ... so after powering down and plugging it in, I booted back up to .. the same no icon desktop with black menus !! ARGHH
It appears that the board, or more specifically the PCIe slot, is causing some PSU issues, as I had already swapped out the Ultra Connect-X 500w unit (measured 11.5 on +12 @ idle) with a Aerocool ZeroDBA 500w unit that measures 11.4 @ idle. This is not good, but I know that either PSU should power my modest hardware, and the Aerocool is indeed a capable unit but the Asrock board is now my main culprit. Asrock's RMA is anything but painless.
It seems to work fine in 2D mode, but I don't build PCs that aren't capable gamers. I wish I could test the AGP slot, but I'd have to steal a video card from my wife's rig, and I know better than to fool with her PC unless I have ample time to repair my handiwork. I have even older AGP cards around, but none that would run Vista, so for now this build sits and waits for Asrock to get the RMA gears spinning.