>>2
He's right (in this case). The head crashed most likely on the disk surface inflicting severe damage and I don't think there's much you can do about this. If even the BIOS can't open a connection to the drive anymore, you have pretty much permanently lost the data.
Try the drive in a different computer to be on the safe side, but it surely won't work. If there is important data on the drive send it to a recovery center - this is probably your last chance.
Then again you might want to contact the manufacture of the HD to get help from the people, who ought to know this HD best.