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What to do when your iMac won't turn on?
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iMac No power hardware troubleshooting using Diagnostic LEDs - YouTube
2013 imac 21.5” power issue, replaced power supply twice, still no diagnostic LED on. The Mac will power on after being plugged in for several hours. And then powers on like nothing
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Apple Technician Guide for iMac (21.5-inch, Late 2009)
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2019 iMac. Diagnostic LED 2 = on, LED 1 = off?! : r/applehelp
Apple Technician Guide iMac (27-inch, Late 2009)
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What to do when your iMac won't turn on?
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What to do when your iMac won't turn on?
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2019 iMac. Diagnostic LED 2 = on, LED 1 = off?! : r/applehelp
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Diagnostic LEDs - Apple iMac 20 inch - Mac Specialist
iMac Pro "8-Core" 3.2 27-Inch (5K, Late 2017) Specs (iMac Pro, Late 2017, MQ2Y2LL/A, iMacPro1,1, A1862, 3144): EveryMac.com
SOLVED: Where are the diagnostic LEDs on the iMac mid-2011 27" EMC 2429? - iMac mid-2011 27" EMC 2429 (2.7GHz i5) - iFixit
SOLVED: Where are the diagnostic LEDs on the iMac mid-2011 27" EMC 2429? - iMac mid-2011 27" EMC 2429 (2.7GHz i5) - iFixit
What to do when your iMac won't turn on?
