Getting ticking noise from the computer and it

This is not a good sign. Try the external hard drive on a different computer.

The arm for the hard drive is probably bad. That is the ticking sound. The arm is loose and not reading the platters. If you have data that needs recovered from the drive, I wouldn't run it any more. Take the hard drive out of the case and find another computer you can put the drive in as a slave. You can try putting the hard drive in a freezer for an hour or so, plug it into another computer and try to get files off of the drive. This might work for a bit until the drive gets warm then you'll have to freeze it again. Freezing the drive might tighten the arm up enough to read for a short time to maybe recover files but the drive is probably toast.