I just raised my GPU frequency through my MOBO from 100 MHZ to 103 MHZ, now my PC is failing to restart. I can't even see my bios. I have a Sapphire 7970, did I just fry my card?
unplug power to the pc. Take out the cmos battery. Hold the power button in for about 10-20 seconds. Put the battery back in. Plug power back and try and boot up then. Oh and I'm guessing you touched the PCI express frequency. I wouldn't touch that. Overclocking a video card using that isn't a good idea afaik.