imac 27" mid 2011 power supply checking.

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can anyone plz suggest me how to check the power supply of imac 27" mid 2011 is faulty or not? my imac is not starting up. are there any smc reset buttons on the logic board.only led 1 shows light rest no lights. there is absolutely no sound of any sort on pressing the power button.
 

chscag

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2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
Welcome to our forums.

Generally, the PS on an iMac is fairly durable. Can you hear or see anything at all when you start it up? Fans? Backlight? Without a schematic it would be difficult to do any measuring of voltages off the PS. Your best bet might be to buy a PS for your iMac off eBay and swap it out.
 

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