1.6, 1.8, or 2 GHz G5 processor

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will not power up

good cord but will not power up

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Most likely the power supply but take the back off, here's how: iMac G5 17" Model A1058 Rear Panel Replacement

You should see two CUDA buttons middle of the board slightly to the left. Ones a reset and one a restart. Plug it in and hit those buttons. Now there should be 4 diagnostic LEDS in the center of the logic board. Please tell us which ones lit up.

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Thank you. I removed 4 screws holding the display and looked under there. There was a major connector top center that had come unplugged. I reseated the connector and it powered up fine. I had it shipped to the Philippines as I retired here and brought it along for a back up. They really toss the boxes around and it must have come loose. Sun Zahu in the art of war stated: the solution lies in first identifying the problem. Those words have defined my life as a HVAC service tech my whole life. Thank you for your prompt reply. I will be doing all my own repairs now that I am retired and will avail myself of this sites services more I am sure.

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@hvacjack - Glad you solved your issue easily. What you may not know is that 98% of these questions are answered by volunteers from all over the world. Most of the guys that give great answers are old because we have the experience. If you need to keep that brain in top shape your help would really be appreciated!


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hvacjack will be eternally grateful.
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