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Post originale di: Chris Yates ,


iMac 27 - 2546 | Power Supply Replaced...still refuses to power up


iFixit Community,

Thanks in advance for the amazing reference information. This site helped me in diagnosing, ordering parts and provided detailed instructions for repairing my late 2012 iMac’s perceived failing power supply.

Because the great iFixit information the power supply was swapped in carefully and quickly, but it still refuses to power-up.

When returning power to the iMac LED #1 is lit solid. When I press the power button, LED #1’s light goes out. No drive noise. No fans.  I have to unplug and re-plug the the iMac before LED#1 will light again.

I suppose this is more of a sanity check.  Does this indicate that the main logic board is faulty?


iMac Intel 27" EMC 2546