Either the drive went doa on you or something could have made the current primary inactive. How about "200 ways to revive a hard drive"? http://www.scribd.com/doc/331068/200...e-a-hard-drive Freeze it! Drop it! Hit it! and other lame ideas seen there.
Unfortunately since you ran the bios HD test and saw the drive get the fail message you may as well try a few of the 200 ways mentioned at the link or boot up from a live linux distro on cd to see if you can access the drive itself provided the heads are still working.