First, if the BIOS allows it, use the 'Detect hard drives' entry in the BIOS list. Accept the automatic detect for your HD in LBA mode.
Then go to the General, Standard CMOS features, or whatever the first BIOS page is, and see what the drive is set to. You will see something like Primary Master HD with the data after it. You will not be able to change data if it remains in Auto here, so set it to User, then change the LBA entry to Normal, CHS, or Large, whichever brings up the rest of the settings for you to work with. Then make the settings comply with whatever gets you closest to rated size on the HD, before setting it back to LBA.
Accept the settings on the BIOS and restart.