I got home from a two week holiday this morning and I turned on my MacBook. I thought everything was normal until I noticed my external drive hadn't popped up on the desktop. I thought nothing of it. My hard drive did this sometimes. So I powered down my MacBook and unplugged the drive. I started up the Mac again and then tried to plug in my external drive. It still wasn't working. I have been trying everything for the past few hours trying to fix it but it just won't show up. I can feel it vibrating from the disks inside and it is heating up like it usually does (did?). Could anyone advise me what to do?