G4 tower keeps shutting down...  I need help!

I don't know how to tell if it is a power issue or a hard drive. Does anyone have any experience with this type of problem?

Here’s some prior posts on Power Supply & Case Fans.
http://discussions.apple.com/thread.jspa?messageID=8548984
http://discussions.apple.com/thread.jspa?messageID=8641095
http://discussions.apple.com/thread.jspa?messageID=7222617
http://discussions.apple.com/thread.jspa?messageID=6388340
http://discussions.apple.com/message.jspa?messageID=6952401
http://discussions.apple.com/thread.jspa?messageID=8451459
 Cheers, Tom

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