Talking about external.. I had a recent one that just didn't power up.. turns out something went wrong inside the electronics of the enclosure.. I pulled it out of the enclosure and plug it stright to my pc and it was fine.
yesterday it was a loud clicking noise but today i only heard one click and that's about it. Sigh* I plug it into my computer and my laptop. it still doesn't work. I have a Western Digital hard drive. i guess i'm bad luck with these hard drive. this is like my second one i have to go through.
usually when you get the clicking noise, its basically means your heads are damaged or crashed, you can't fix it yourself because it requires a clean environment, opening your harddrive and exposing the platter to a spec of dust would render your harddrive useless. So yea the drive is pretty much dead, unless you can get someone to recover its data, my cousin had a WD external and i noticed that it uses only 1 plug , my classic freeagent external uses 2 cables one says (power+data, and Power), im guessing its to prevent harddrive failure cuz i abused that hard drive so badly lol, i leave it on plugged into my computer for like 3 yrs straight now with the light on lol, sometimes i accidently drop it a few times, but never had any problems with it since i bought it the first day.