Backup! backup! backup! And then backup again!
Freezing won't work unless the drive des NOT spin. Motor bearing failure is the most common hard drive failure mode.
There could be a few things to try:
1. Your BIOS might have been zxnrbled (or virused) to the point where it thinks the wrong drive is there.
2. Your disk controller chip on the computer motherboard or accessory card may have failed.
3. The drive selection jumper may have fallen off the drive. In this case, two devices may have the same address. If so, they will fight over the right to have that address instead of working.
4. Check the cables. If the data cable is upside down, or if one or more pins is disconnected from the cable, it won't work.
5. Your virus checker may have quarrantined the disk.
6. If you had a power failure, the damage might be restricted to the partition table, the timing marks, or the directory. Norton makes tools for unzxnrbling those.
7. If a worm got your hard drive, it's probably all blank.
8. If it made a loud screee when it failed, a headcrash occurred. It would take a disk drive manufacturer's tech in a clean room with a bunch of spare parts just to see if anything is left. Got a couple of kilobucks to spare?
9. If it's going bang-bang-bang, or if it sounds like a maraca if youi turn it upside down, the bakelite disk platter shattered. Bye bye drive.
10. If the circuit board on the drive failed, that can be replaced at a cost.
11. The drive may have been exposed to a strong magnetic field (such as the permanent magnet in a subwoofer).
If only the data have been erased, the drive can still be reclaimed by reformatting it.