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Helpful answers
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Aug 7, 2013 5:59 PM in response to Mariasandraby John Galt,If it does not power on at all, the cause may be as simple as a corrupted parameter in your iMac's System Management Unit (SMU).
Try resetting it according to the following instructions:
If that does not prove successful, carefully read and follow these instructions, which include the above procedure:
iMac G5: Troubleshooting when your computer won't turn on
Good luck, I hope you can get it working again!