I had an external drive that did that suddenly stopped working
Got it ready for RMA and thought why not try it again. It worked for some reason and i got off it all that i wanted, then returned it.
Since it's out of warrenty u could take it out ? Put it in your comp might work ?
Also sometimes the drive mechanism can get stuck, so if u gently tap it firmly on a hard surface u may make it work again ? Worth a try as a last resort.
Anyways good luck with it.
Marcus.