when you shake it does it rattle?
It sounds like either a loose connection and/or there's a bit of metal short circuiting it inside. Was the computer on when it fell? Laptop drives are notoriously tricksy at the best of times. There's a little catch on the drawer that locks it in. If that's broken off it's new drive time. That or duct tape...
pcdocmail@talktalk.net, October 2006