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Brucehankins Wouldn't pulling and replacing the CMOS battery also reset the bios and maybe get him to a bootable state? Or at least able to get into BIOS possibly?
It will reset the BIOS, and that might help get past the "F2/F12" issue if the BIOS is the block rather than a screwed up HHD. Might not hurt to replace the CMOS battery with a new one while he is at it, given the age of the computer, and the amount of work on an E6420, to get to the CMOS battery.