External drive not appearing

Not sure if this goes here or not, but having a problem with the external HD. I used it a week ago and it was working fine. Today i hooked it up to the computer and it treats it like its not even connected. It's not showing anywhere on the desktop or in the finder. Now when i hook it up to my friends power book it works fine. What could the problem be? Also the USB ports work fine cause i hook up other things and they work fine as well.

Is the drive plugged in to a wall outlet? It'd better be.

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