Can you please describe in greater detail exactly what part of the process fails? To be able to diagnose and troubleshoot, we need to have abetter idea of what the nature of "doesnt work" is. Presumably it will not boot a system from the drive, however does the drive spin up at all and if it does, does it stay spinning or spin up then shut down?... if it spins up, are there any access noises, or other noises that are less promising? Assuming the drive does actually spin up to full RPM, does it mount a volume on the desktop when booted from a floppy or another drive, orr does it simply act as though the disk isnt there? If you havent booted from a known good drive yet to ascertain this, you need to do so... I would like to assume you have, however I find it best to assume very little when it comes to troubleshooting. Assuming it does not mount the volume to desktop, does a disk utility such as Drive Setup  or Norton detect the physical presence of the drive at all (the drive itself, not to be confused with the formatted partition/s on it which are mounted to desktop) or is it basically non-existent to the computer?

Answering these will give a far better picture of what we possibly are dealing with.