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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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Will not power on consistently

If I keep playing with it it will eventually turn on but the minute I turn it off I cannot get it to turn back on

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Sounds like your power supplies soft power on logic has a problem. Most likely you need to replace the power supply. Are you up to fixing your own system? If you are review this IFIXIT guide: iMac Intel 27" EMC 2429 Power Supply Replacement

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Marilyn Callinan will be eternally grateful.
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