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How to find and read the Diagnostic LEDs - iFixit Repair Guide
Amazon.com: Apple iMac 21.5in 2.7GHz Core i5 (ME086LL/A) All In One Desktop, 8GB Memory, 256GB Solid State Drive, MacOS 10.12 Sierra (Renewed) : Electronics
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How to read the diagnostic LEDS on 2019 21.5" iMac - iMac Intel 21.5" Retina 4K Display 2019 - iFixit
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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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