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6MB 공유 L3 캐시 2.4GHz, 2.7GHz, 또는 2.8GHz 쿼드-코어 Intel Core i7 프로세서 (Turbo Boost 최대 3.8GHz).

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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.

  1. Resetting the NVRAM (No effect)
  2. Resetting SMC (Didn’t Work)
  3. 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).
  4. Internet Recovery Does happen, complete the process but start the loop again after the recovery completion
  5. I have a backup in Time Machine, Doesn’t Boot Up into recovery mode, Could find any other method to restore.
  6. 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.

Update (07/18/2019)

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

답변되었습니다! View the answer 저도 같은 문제를 겪고 있습니다

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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.

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PC 노트북 배터리

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PC 노트북 배터리

큰 전력 향상을 위한 손쉬운 수리.

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선택된 해법

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.

Update (07/19/2019)

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

Update (07/21/2019)

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):

Block Image

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

Block Image

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.

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Update: Diagnostic Test Completes with "No Trouble Found"

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@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?

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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.

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Run diagnostics again this time run the longer tests.

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