Hard drive not showing up at all?

I have an external hard drive that is not being recognized by the computer. It doesnt show up on the desktop nor on Disk Utility? How can i fix this?

Is the drive connected via USB or Firewire?
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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