I'm with TreeFrog here. If you absolutely cannot reset the BIOS with the jumper or 'CLEAR CMOS' button on the board, then you're out of luck other than trying to re-flash another copy onto the chip, or trying to completely replace the chip. Are you sure it's a failed overclocking? I'm assuming it's throwing up the 'Previous Overclock has Failed' error, but the last I checked, you can fix that by powering up and down the system three times. At least that's what the manual to my 790FX says. Can you tell us what it's showing on screen when this happens?