Where are the diagnostic LEDs located on a 27" iMac (late 2009, 3.06GHz)? | MacRumors Forums
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SOLVED: Where are the diagnostic LEDs on the iMac mid-2011 27" EMC 2429? - iMac mid-2011 27" EMC 2429 (2.7GHz i5) - iFixit
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mid-2011 imac no power--logic board? | MacRumors Forums
iMac No power hardware troubleshooting using Diagnostic LEDs - YouTube
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27inch iMac (late 2013) Diagnostic LED 1 flickers then off, already tried a new psu(AliExpress). Any ideas? do I try logic board next? : r/LukeMianiYouTube
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mid 2011 27" won't power up and only 1 diagnostic LED | MacRumors Forums
SOLVED: Won't Boot: How to diagnose if Logic board or PSU at fault? - iMac Intel 21.5" EMC 2428 - iFixit
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