Ummm. Buy Disk Warrior?
If the unit lost power while it was writing something to the platters, that segment of the disk, at least, is trashed.
Start making plans for what you would do if that drive never woke up again.
Is the power cord loose in the socket, or is the whole assembly loose even though the cord is tight? If it's loose inside, anybody with a screwdriver and soldering iron might be able to repair it enough to get the lights to come on again.
Do the lights come on now and it doesn't mount, or is it completely dead?
Koz