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

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Does not power on. dead

This iMac wont turn on. No start up sound, no video, no fan, totally dead.

The LEDs on the logic board don't show any light.

I guess is the power Supply, but before buying a new one, I would like to test it. Is there any way to do it?

Thank you

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Double check your line cord first. Otherwise no real way without a DVM to test the voltages. What happened with it? did it work and then stop?


LIne cord is ok. iMac was working ok and suddenly stops. Is a DVM a Multimeter?


Yes, a multimeter will work (D - Digital, V - Volt, M - Meter)


NOw the big question since I use the DVM only to test batteries, do you know how to use to test this power supply? Or if you know is there any web site with pictures? Thank you very much


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Here's the iFixIt guide to replace the power supply for this model Power supply. I would first make sure the AC in & DC out cables where not loose. Then I would check for any visibly damaged components.

If I didn't see anything I would do a little probing to check if the power button was working and check logic board was getting voltage. At this point you would need to have the system powered to check anything. Otherwise, I would just swap out the supply

CAUTION you can hurt your self as well as your system if you don't take proper steps. Ideally, you should have an isolation transformer to protect your self from the direct line voltage. In addition placing the probes directly on the power supply when you don't know what you are touching could damage it and the main logic board.

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Most Helpful Answer

Your machine may still be under warranty. Go here and enter your serial number to see if it is:

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+ Hey Mayer, hope all is well in your world. I haven't been on here or seen you in a while.


The warranty is expired.


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Flavio will be eternally grateful.
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