iMac will not power up.

Question

iMac Intel 27" EMC 2429

모델 A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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Jason @jmere3

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게시일: 2018년 11월 26일

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iMac will not power up.

The first LED lights up when plugged in but as soon as I press the power button the 1st diagnostic LED goes out and nothing happens. I have to unplug for 10-30 seconds but then just the 1 LED comes on and same issue once I press the power button.

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Power Supply is on order!!

Jason 의 2018년 11월 26일

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[deleted] @deleted78791

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Your power supply is kaput. Diagnostic LED #1 is related to the PSU and typically is the only LED that will light up when the PSU is kaput.

iMac Intel 27" EMC 2429 Power Supply Replacement

iMac Intel 27" EMC 2309, 2374, 2390 or 2429 Power Supply

Here’s what the diagnostic LEDs mean if you wanted to know more about them.

LED 1 - Indicates that the trickle voltage from the power supply is detected by the main logic board. This LED will remain ON while the iMac is connected to the AC power. The LED will remain on even when the computer has been shut down or put to sleep. The LED will turn off only if the AC power is disconnected or the power supply is faulty.
LED 2 - Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.
LED 3 - Indicates that the computer and the video card are communicating. This LED will be ON when the computer is communicating properly with the video card. If LEDs 1 and 2 are ON and you heard the startup sound, but LED 3 is OFF, then the video card might be installed incorrectly or need replacement.
LED 4 - Indicates that the computer and the LCD display panel are communicating. This LED will be ON when the computer is turned on and video signal is being generated. If the LED is ON and there is no image on the LCD display panel, the LCD display panel or inverter might be installed incorrectly or need replacement.