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Repair guides and support for 21.5" Intel iMacs by Apple.

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iMac Black Screen Problem

Hi everyone. I recently replaced my 3.5 HDD with a 2.5 SSD. The problem is that after my iMac screen was black. I tried to replace the display port lcd cable but with no success, still black screen.

I read many posts about this issue (most of them here) and decided to buy a new LCD and Inverter board.

I did it but still got the problem.

Some details:

Diagnostics leds 1,2,3 are ON

Diagnostic led 4 is OFF and don't blink on startup.

My iMac EMC is 2389.

Tried to find any burned circuit or even the famous L9000 but could not.

Any hope for me?


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Please go here and input the serial number from the bottom of your stand, then tell us exact which machine you have.



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It's really simple there is nothing on the drive. It will be black.

Before you do anything you have to do either Internet recovery right from start-up or it will always just display a black screen.

You need at least a USB bootable drive or you could try an Internet recovery but obviously the Internet recovery takes a long time as it has to download everything and the basic system tools.

I'll try the Internet recovery even though it takes a long time the guide can be followed here. Once you get into your basic tools you need to use Disk Utility and make a petition and format it. Once you've done that your exit disk utility and then proceed with the install of whatever OS it is.

It's basically looking for something that isn't there so I can't show anything.


Here is how to use MacOS Internet Recovery:

  1. Shut down your Mac.
  2. Hold down Command-Option/Alt-R and press the Power button. ...
  3. Hold down those keys until you a spinning globe and the message "Starting Internet Recovery

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Cristiano Henrique будет вечно благодарен.
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