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Contribution d'origine par : Joe ,


iMac Will Not Boot With LCD Installed


Hi, I will preface by saying I fix Macs for a living and am pretty skilled at troubleshooting and diagnosing, but this one has got me a little stumped, so I’m looking for some second opinions.

I have a mid-2011 27in iMac that will not boot when the LCD is installed.  It powers on starts loading the boot progress indicator, then goes to a white screen for a couple minutes and reboots.  If I take the LCD off and use an external monitor it boots up and works normally every time.  The condition is 100% reproducible.  Weird, right?

Here’s troubleshooting I’ve done so far:

* Passes all hardware tests on ASD 3S145A EFI boot disk
* Replaced video card
* Installed known good hard drive and installed macOS High Sierra
* Installed known good power supply
* Installed known good screen inverter board
* Alternated pairs of memory to ensure no bad RAM or memory slots

At this point, I feel like it has to be the logic board, but looking for some additional input before I throw more parts at it since I don’t have a logic board laying around for this model.


iMac Intel 27" EMC 2429