IMac external hard drive will not show up on desktop

I have an external 60 GB hard drive that is attached to an IMac.
I used to be to access this hard drive, but now the IMac will not see it and it does not appear on the desktop anymore. I have another Mac computer and have hooked this hard drive up to it, and it shows up just fine on this other computer's desktop, so I know the hard drive should be working.
What should I try doing to get this hard drive show up on the IMac?

Is the drive connected via USB or Firewire?
USB and FireWire Quick Assist
http://support.apple.com/kb/HT1151?viewlocale=en_US
What to do if your computer won't recognize a FireWire device
http://docs.info.apple.com/article.html?artnum=88338
Dealing with FireWire problems (drives not mounting, devices unrecognized, etc.)
http://www.macfixit.com/article.php?story=20041221081432908
Common fixes for USB device issues (unrecognized, etc.)
http://www.macfixit.com/article.php?story=20070824012114701
 Cheers, Tom

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IMac external hard drive will not show up on desktop

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