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The Power Macintosh G4 is series of personal desktop computers released by Apple in 1999, and sold through 2004. This page is for the M5183 designation.

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What is the buzzing when powered on.

When I power on my G4 Power Mac there is a loud buzzing sound.

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Most likely your Power Supply Unit is getting ready to fail.

If this answer is acceptable please remember to return and mark it.

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