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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
SOLVED: Where are the diagnostic LEDs on the iMac mid-2011 27" EMC 2429? - iMac mid-2011 27" EMC 2429 (2.7GHz i5) - iFixit
How to Use Apple Diagnostics to Test Your Mac - MacRumors
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SOLVED: What are the 5 diagnostic LEDs? - iMac Intel 21.5" Retina 4K Display (2017) - iFixit
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iMac 27 2011 - wont boot up, diagnostic LED #2 blinking | MacRumors Forums
