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Model A1419 / Late 2013 / 3.2 & 3.4 GHz Core i5 or 3.5 GHz Core i7 Processor, ID iMac14,2

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iMac has a black screen and won’t boot up.

I’ve got an iMac 2639 27” late 2013 that won’t boot up. Here are the particulars:

1. When plugged in it does nothing when you press the power button

2. If you hold the power button in and plug in the power cable it starts the fans running very loudly, but nothing else happens after that- no display, no sound, no boot up.

3. Looking up through the bottom vents I can make out two green led lights on.

Wondering what to do next? Should I open it up and check the led lights to help narrow down the trouble?

Any suggestions would be greatly appreciated

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Yes, you’ll need to review the onboard diagnostic LED’s. Follow this IFIXIT guide: iMac Intel 27" EMC 2639 Display Replacement and make sure you use the correct tools as you can very easily damage the display.

Here's a breakdown of the onboard diagnostic LED's:

Block Image

  • 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.

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1 Comment:

I figured taking it apart was the route to follow, so I’ve ordered all the tools and new adhesive strips. Wish me luck.

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RogerB will be eternally grateful.
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