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Modelo A1312 / Mediados de 2011 / Procesador Core i5 de 2.7 & 3.1 GHz o Core i7 de 3.4 GHz

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Mid 2011 27” iMac won’t turn on diagnostics LEDs stay dark

Hi everyone,

So my trusty grandma iMac died on me a few days ago. I ordered a replacement power supply here on ifixit since the diagnostic LEDs did not light up at all (used different cables and outlets as well) and unfortunately even after replacing the power supply / psu nothing happens. No fans. No sounds. Nothing.

I know investing more money in fixing it is not really worth it due to its age but I am really not ready to give up yet 🥹

Any Ideas what my next steps would be? And how I can further narrow down what exactly is not working?

Thanks in advance ☺️


We had an outage a while back.

I had a Bluescreen on Windows 10 (I use dual boot) an hour or so prior to its death:


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@qa1ysllewbt5zkq start off with the things that don't cost money:

• First disconnect the power cord from computer, then reconnect it to reset the LED status, in case computer was correctly shutdown and AC was kept connected since

• Verify AC source

• Verify known-good power cord is connected

• Verify cable connection between AC inlet and power supply

• Verify cable connection between power supply and logic board

Usese a voltmeter and check if you have AC power on the Power supply. do not forget to check you EMI filter power plug (where the power cord plugs in) Make sure you have power to the board from that. Since you are checking on 110v / 220V AC voltages, you do want to use common sense and do not touch anything with you bare hands etc.

If all of that checks out okay and since you are having a new power supply, the issue could be your logic board. Remember it is the logic board that "senses " the voltage to turn the diagnostic LED's on. If so then it is up to you want you want to do. Either replace or try to fix the logic board.

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Myah estará eternamente agradecido.
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