My external hard drive does not appear.

So I have a 500 GB USB 3.0 HDD. It does not show up in the Finder. It also doesn't show up in Disk Utility, Time Machine, or the terminal command diskutil. I used both USB ports and it still doesn't work. I even tried a normal USB 2.0 cable and it still doesn't show up. The disk's packaging says it is compatible with USB 2.0, and it can be recognized and read on other computers, but not mine.
Also, if my computer is booted with the hard drive plugged in, it gets stuck at the gray screen. Holding C during bootup also causes it to get stuck.
The hard disk is encrypted (filevault 2) and I make all mounted drives appear on the desktop.

Hey guys,
I am having the same issue with my HD.   It was working one day and then the next my mac does not recoginize that it is even pluged in....yet I can move my external hd to my macbook pro and it sees the drive.   I have tried shutting down the system, using the Y connector, using an alternative power source, Reformating the HD, and still nothing works, yet it works on all my other MAC's and I have 5 totall macs!   I don't get it, why all the other mac sees it but this one want.   I have tried to plug in other external HD to the mac that is not reading the HD and it will work with them.  Any ideas as to why it want see this one HD?

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    Message was edited by: macjack
    Message was edited by: macjack

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