Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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Wont turn on. Diagnostic led no light

iMac does not power ON

Hi,

I have a Power issue with my mid 2011 iMac.

I've already opened it up. I have experience with repairing electronics, etc. But now i'm stuck. On the logic board ( Main board) :

Diagnostic LEd no light, I measure 12v and 5v on the supply.

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@djdanny what is the exact model of your iMac? Which one of the LED's is not coming on? what else have you checked? The more information you give the greater the chance of getting valid answers

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Imac 2011 mid 21,5" i5 quad core

No status led light on motherboard.

I check power cord and psu 12v and 5v

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@djdanny if you have no LED light up you are having problems with the PSU. You said you tested it for 12V and 5V but are not telling us where and how you tested this. At this point I would consider starting by replacing the power supply and/or double check your connections etc.

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I have the same issue, I only have led 1 and when i press the power button - led 1 shuts off. There is a little fan spin for a millisecond.

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Djdanny will be eternally grateful.
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