I have a Western Digital External HD and am using an emac computer. I left my hd plugged into another mac for a week while I was on vacation, it was working fine. When I got back it was not showing up on the computer, and would not show up after I unplugged it, restarted, etc. I thought maybe it was the computer, but it will not show up on mine either. I cannot be sure the hd was not dropped, but I was told that it was not dropped. Anyway, it turns on when plugged in and makes noises like it's working, and the lights are on. It just does not show up on my computer. My friend said this is probably a case problem, but I don't know what to do in general about it. Is there anything else I could do to possibly make it work?