Re: flashed video card.
yeah you can flash the newer video cards to say a newer bios like you do with mobos. Your new bios is setting something out of wack if you are running a water cooling then heat probably isn't the issue but that doesn't mean that the video card doesn't "think" its beeing over heated. If all else fails re flash it. I'm flashed cards before but always to scared to do my own.. just like I never over clock my own hardware.
AMD 4000+ w/ san diego core, Gigabyte GA-K8NSC-939 mobo, 1GB of Corsair XMS ddr400, 1GB Rosewill w/ black heat spreaders ddr400, (2GB of RAM total), ATI X850XT Platinum Edition (AGP), 160gb Seagate sata HD, 120gb Western Digital IDE backup drive, Antec smartpower 2.0 450w PSU, Logitech MX 518 expert gaming mouse. Logitech Precision PC Gaming Headset