21.5" A1418 EMC 2889 no power!

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So my Mac wouldn't turn on, no chime, no fan, black screen. Read the unplug power source from back of unit and plug back in, didn't work so I unplugged the cord from the wall and gave up for that time being. One of my kids plugged it back in not knowing a few days later and voila it worked! Although it only lasted for a couple days then went dead again. I tried doing all the same things and nothing. Then I started researching everything I could. Ordered a new power supply which everything led to but no dice. I then figured out how to test the power supply with a multimeter and there is power so that is good. Learned about the diagnostic led's but mine has none. When I do unplug the power cord from the back of the unit and plug back in, LED #1 blinks once then goes off, like a flash more like it. Only sign of power I am getting. Read more about everything and removed the hard drive, reinstalled the PRAM battery, etc and still nothing! Assuming it's the logic board at this point unless someone has a magical trick that may have worked for them? I have not tried removing the video card yet which some people say may be causing the short and needs to be taken out to reset. Just didn't feel like taking everything back apart if that's not the problem. I did look at both the logic board and power supply and don't see any blown capacitors with the naked eye. I guess my question is, is there a video that can show me how to find the short in the logic board with a multimeter for my exact machine? I saw one video in Hindi I could not understand but was not the same exact logic board. Any help/suggestions would be great!

Frustrated!
 
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Your Mac's Specs
2011 27" iMac, 1TB(partitioned) SSD, 20GB, OS X 10.11.6 El Capitan
21.5" A1418 EMC 2889 no power!


That seems to be a iMac "Core i5" 21.5-Inch (Late 2015) model and you don't mention your Mac fix-it experience and competence, but you might want to contact a good Mac tech and maybe they can resolve your problem.

It could even be due to just a dead boot drive, but right now it seems as if you are just charging at some windmills for a solution or fix.





- Patrick
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K
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If I take it in to an apple store I’m assuming they would be able to diagnose the exact problem? Such as the boot drive?
 
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Your Mac's Specs
Silver M1 iMac 512/16/8/8 macOS 11.6
An Apple Store or Reseller.

Don't know where you are situated, but maybe 2012 model is considered obsolete by Apple which could well mean an Apple Store won't handle it but a Reseller will.
 

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