MacOS Apple Logo Restart Loop

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MacBook Pro 15" Retina Display Early 2013

2.4GHz, 2.7GHz, or 2.8GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.8GHz) with 6MB shared L3 cache. Released February 2013.

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M Umair Anwar @mumairanwar

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Postado: 18 de jul de 2019

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MacOS Apple Logo Restart Loop

I Bought Mac-book Pro Retina like a year ago, but suddenly it started giving kernel panic error. After Surfing through internet, found out the problem with U8900 IC (Pretty Common with this model). Though I repaired it But my macbook is not booting to login screen. So, The machine gives chrime sound, apple logo appears with status/progress bar, and it stops halfway, after that “Your Computer Restarted because of a problem“ error appears and restart again and the loop continues.

I tried.

Resetting the NVRAM (No effect)
Resetting SMC (Didn’t Work)
Booting to Recovery Mode (Didn’t work. not even boot into recovery screen, Apple Log Appears and then stuck again, No restart). Booted into Drive Selection Mode but only one Drive Appears (No Recovery Drive).
Internet Recovery Does happen, complete the process but start the loop again after the recovery completion
I have a backup in Time Machine, Doesn’t Boot Up into recovery mode, Could find any other method to restore.
Doesn’t Boot into Safe Mode. Stuck at Apple Logo (No restart).

I’m thinking there may be need to reformat and reinstall the new OS but I want to make sure if that’s the only Option Left.

Any Suggestion or Solution would be really appreciated. Please.

Really grateful for taking the time out for this.

I've tried running bootable installer but the machine got stuck in apple logo.

After trying some other solutions I got the crash report booting in Single User Mode. Attaching By.

Crash Report

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You can install MacOS onto an external hard drive or flash drive but this requires a working MacBook if I remember correctly in order to do so.

19 de jul de 2019 por Ben

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Dan @danj

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Postado: 19 de jul de 2019

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I would boot up under an external bootable drive, run Disk Utility - First Aid to fix any drive issues. Then, run a good anti-virus and malware app with the latest definitions to make sure you don’t have something else lurking.

The next action would be to remove the SSD place it into a OWC case hooked up to a second system then make a backup of the users stuff to an external drive. Then reformat the drive and install a fresh copy of MacOS (same as what the system had) reinstall the SSD is the system working now? If it is then restore the user accounts, apps and users data.

In reviewing your crash report you have a deeper problem. I’m suspecting you have a logic board issue. Are you able to get diagnostics to run?

Reference: Mac startup key combinations

Sadly its time for a new logic board ;-{

If we look at the top side of the board we can see the location of the dedicated GPU (Red outlined chip):

If we look at the backside we can see the dedicated GPU’s V-RAM (Orange outlined chip’s)

I’m suspecting one of these V-RAM chips has failed and/or the GPU its self.

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Just Started the Diagnostics. I'll update you after the diagnostics test completes.

from this reference link. Only Command+R is not working. Else are working....!

Appreciate your help.

19 de jul de 2019 por M Umair Anwar

Update: Diagnostic Test Completes with "No Trouble Found"

19 de jul de 2019 por M Umair Anwar

@mumairanwar - Did I miss something here??

You couldn't boot up under an external drive? Or where you able to?

Reformatting your internal drive and re-instlaeding the OS din't fix things is that correct?

20 de jul de 2019 por Dan

No I couldn’t reinstall or reformat my internal drive. When I connect my bootable usb, It appears in target mode but when I boot into it, machine got stuck at Apple logo Screen with half progress bar.

Also tried connecting my Time Machine external drive but still faced the same problem.

I also tried booting into recovery mode, machine stuck at the same screen. While using internet recovery mode, I gets the globe, completes the process but doesn’t solve the problem.

20 de jul de 2019 por M Umair Anwar

Run diagnostics again this time run the longer tests.

20 de jul de 2019 por Dan

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You can install MacOS onto an external hard drive or flash drive but this requires a working MacBook if I remember correctly in order to do so. — Ben
Just Started the Diagnostics. I'll update you after the diagnostics test completes.

from this reference link. Only Command+R is not working. Else are working....!

Appreciate your help. — M Umair Anwar
@mumairanwar - Did I miss something here??

You couldn't boot up under an external drive? Or where you able to?

Reformatting your internal drive and re-instlaeding the OS din't fix things is that correct? — Dan
No I couldn’t reinstall or reformat my internal drive. When I connect my bootable usb, It appears in target mode but when I boot into it, machine got stuck at Apple logo Screen with half progress bar.

Also tried connecting my Time Machine external drive but still faced the same problem.

I also tried booting into recovery mode, machine stuck at the same screen. While using internet recovery mode, I gets the globe, completes the process but doesn’t solve the problem. — M Umair Anwar

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