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If the lights do turn on, but you cannot retrieve the data, then you need to plug the drive into a computer with a different os and try to reformat it in there. Unlikely, but possible to work.
So I have had my external hard drive for a while but recently it had been not working. It will not show up on my Desktop, Finder, or Disk Utility. I have been to Best Buy and they said it could be a formatting problem but I can't reformat it because it won't show up.
please watch this video provided: My hard drive is not working
If you know how to fix this, please help! This hard drive costed me almost $100 and I don't want to have to replace it.
Edit:
My mac supports USB 3.0