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iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 또는 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz 또는 Core i7 2.8 GHz) ID iMac11,1

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Where are the diagnostic LED’s located?

With power connected, I see no lights.

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Motherboard replacement got it working.

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Hello, I don't have the motherboard diagram on hand but the indicator light is easily visible, if there is no indicator light on, first check the power supply outputs with the multimeter.

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Thank you for responding. There are many comments on the web about these indicator or diagnostic LEDs but none of the associated pictures match my EMC 2374 logic board so I’m still trying to find their location. I do have a simple multimeter and can measure the voltage going into the power supply but I don’t know where to measure it’s output. There is supposed to be a “trickle” voltage being output when the unit is plugged in but not powered on.

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