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SOLVED: iMac wont start, only diagnostic led 1 on - iMac Intel 27" EMC 2309 and 2374 - iFixit
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Mac Pro 6,1 Late 2013 Diagnostic LEDs - LogiWiki
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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