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Hi. I have iMac 21.5, Late 2009. It worked just fine till last week, when I turned it off (system shut down) and disconnected the power cable before going to vacation. After a week I wanted to power on the iMac (with power cable switched), but nothing happens. I tried the the “trick” with resetting the SMC, and still nothing. Checked the diagnostic leds: Diagnostic Led #1 is ONDiagnostic Led #2 is OFF after “Power On” button pressedLogic Board Test Point: Pin 1 and Pin 4 has 12VLogic Board Test Point: Pin 1 and Pin 12 has around 2,5V (always) Does anybody know what could be suddenly wrong? Kind regards, Mitja
It sounds like an issue with the connection between the power supply and the logic board, or the power button and the logic board. Also, what happens with pin 11 when you press the power button? If second LED is not visible when power button is pressed: • 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
