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iMac died after loud "pop" and will not turn on, why?

Hi,

My iMac was in sleep mode, when i moved my wireless mouse to wake it... the computer made a loud "pop" and shut off... I tried turning it on, but nothing. I tried diffrent outlets and still nothing. Someone suggested i open it up and check the Capacitors... I did, but they look fine. The ones on the power supply look fine as well. It has no warranty anymore, it's why I decided to open it up. Now i don't know what to look for, Should I just get a new power supply?

Someone please help... I know it's an old computer, but I really don't want to trash it.

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after the "pop" did you smell something burnt?

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No burnt smell... Even after i opened it up... I sniffed all over, but nothing. :( I'll check the capacitors again... maybe i could've missed something.

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Chosen Solution

Check the diagnostic LED lights if #1 is out it's your power supply.

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To be honest... I did not check for lights after i opened it up... All i am sure of is that the power button had no response whatsoever. Now it's all disassembled, so probably can't check for lights any... Or can I?

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Hmmm... I'll have to put it back together to check this. I'll do that and get back with the LED results.

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Same exact thing happened to my iMac. I have a 2012 iMac and it won't turn on after the loud pop. I have tested the cord and the power supply and all seem to be fine. There are no burning smell and I don't think the 2012 iMacs have the diagnostics LEDs. I am worrying that my logic board has failed.

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Have you fixed your iMac since then ?

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What did you end up finding out? I have a 2012 iMac, 21.5" and they DO have the diagnostic LED's. #1 is on for me. I am having the same problems as you.

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felipe will be eternally grateful.
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