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Model A1419 / Late 2012 / 2.9 & 3.2 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac13,2

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27" 2012 iMac Not powering on after HDD change, Diag LED #2 flashes

Hi All

Thought I’d help out a friend who had a 27” 2012 iMac with a failed HDD by replacing it. Changed loads of drives before on Windows machines so wasn’t too concerned about working on a Mac for the first time…… How wrong was I!

Cut the adhesive round the screen, got the drive changed, and use a can of air to clear some of the dust in the bottom vent holes and around the machine, didn’t touch anything else. The Mac now fails to power on, Diagnostic LED 1 stays on the entire time, LED 2 flashes every 5 or 6 seconds as it tries to power on, the optical sensor on the cheap USB mouse connected also flashes at the same time, this continues until you hold the power button for a few seconds to power it off. The fan does not spin, and there is no chime

Any ideas how to resolve this, or is it toast?

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LED 1 indicates that the system is receiving power, so that would match with your computer. LED 2 is that the logic board is detecting proper voltage from the power supply. It also is used to show if the logic board regulators are working properly. Here are some things to try if the second LED is not working or flashing:

• Verify power button connection to logic board

• Verify power button functionality

• Verify cable connection between power supply and logic board

• Verify power supply

• Verify logic board

Source: iMac Service Manual: https://data2.manualslib.com/pdf3/63/624...

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Chris Scott will be eternally grateful.
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