|Exactly, If you are trying to BOOT to the drive, it will not work in another machine. You MUST leave in the original hard drive to boot to and add the drive as a second hard drive. If it is recognizes it, IMMEDIATELY copy the files to the other computer's hard drive (fastest transfer rate) ASAP (you do not know how long it will continue to be available) and worry later about transferring the the files back through portable media. If it is not recognized the you are out of luck, or if the files are important enough then you will have to spend big money with only a chance of success (here, reputation of the service is your best indicator of your chances for success, but no guaranty). If you are not into spending the money then this suggestion I heard of (never needed to try it) might be worth the bother: Put the hard drive into a ZipLoc bag, remove as much air from the bag as you can. put the drive into your freezer for a few hours, then immediately on removing it from the freezer, try it again in a waiting desktop (as the second drive again). IF this works, it will be short lived.|
Replace the drive.
Back up, Back up, Back up.
You have to be a little bit crazy to keep you from going insane.