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User profile for user: Womke2
Womke2 Author
User level: Level 1
8 points

Macbook Pro 8,2 keeps rebooting.

When I want to power on the Macbook Pro, it chimes and the goes to about the half of the progressbar and the turns to a light blue grey screen for a little time and then keeps rebooting when the magsafe is connected. On battery it just shuts down and no loop.


The problem started when I wanted to look a serie on google chrome. The screen splitted and the horizontal lines. OS was still ok. Rebooted and looked the serie on safari: no problem. Went back to chrome for some reason. But the macbook just started to reboot.


So I've tried a number of things to check what the problem could be:

Reset SMC, no change

Reset RAM and change RAM, no change

start in safe mode: screens stays in the blue grey screen

start in diagnostic mode: did hardwaretest: no hardware problems.

Last year I've put in ssd, I changed this one with the old hd: but the same problem.

Start the macbook without battery, only magsafe power, the same problem. (saw youtube video where the battery was the cause of a bootloop)


I don't think it's a software problem, but I'm not shure.

I think it has to do something with the videocard or the screen.


Is there a way to test this? Or are there other tests I can do to find the problem?



MacBook Pro 15", macOS 10.13

Posted on Jan 18, 2020 1:19 AM

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User profile for user: Womke2
Womke2 Author
User level: Level 1
8 points

Posted on Jan 19, 2020 2:30 AM

How do I install this application? I can't load osx.

In safe mode I don't see a thing...


I found another solution: I tried the single user method for osx in this thread:

https://forums.macrumors.com/threads/force-2011-macbook-pro-8-2-with-failed-amd-gpu-to-always-use-intel-integrated-gpu-efi-variable-fix.2037591/


Or try the simplest way - No needed ArchLinux - Only MacOS:



1 - Boot Single User (press Command + S) at boot (If you have MacOS installed on your hard drive).



2 - If you have a blank HD, then use the USB stick/Pendrive with the MacOS installer (El Capitan, Sierra or HighSierra).



2.1 - Press Option key at boot, Position the mouse on the MacOS installer icon.



2.2 - Press Command + S and keep holding these two keys.



2.3 - Click the MacOS installer icon -> continue holding the Command + S keys until you finish the MacOS installer Single User boot .



Enter these commands (change gpu-power-prefs to Intel GPU and boot verbose):




Code:



nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00

nvram boot-args="-v"

reboot



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User profile for user: Womke2
Womke2 Author
User level: Level 1
8 points

Jan 19, 2020 2:30 AM in response to BDAqua

How do I install this application? I can't load osx.

In safe mode I don't see a thing...


I found another solution: I tried the single user method for osx in this thread:

https://forums.macrumors.com/threads/force-2011-macbook-pro-8-2-with-failed-amd-gpu-to-always-use-intel-integrated-gpu-efi-variable-fix.2037591/


Or try the simplest way - No needed ArchLinux - Only MacOS:



1 - Boot Single User (press Command + S) at boot (If you have MacOS installed on your hard drive).



2 - If you have a blank HD, then use the USB stick/Pendrive with the MacOS installer (El Capitan, Sierra or HighSierra).



2.1 - Press Option key at boot, Position the mouse on the MacOS installer icon.



2.2 - Press Command + S and keep holding these two keys.



2.3 - Click the MacOS installer icon -> continue holding the Command + S keys until you finish the MacOS installer Single User boot .



Enter these commands (change gpu-power-prefs to Intel GPU and boot verbose):




Code:



nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00

nvram boot-args="-v"

reboot



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User profile for user: BDAqua
BDAqua
User level: Level 10
245,189 points

Jan 18, 2020 12:20 PM in response to Womke2

This Mac is of the generation that often had the discrete GPU chip fail.


I have this model, and my chip has failed. I force my Mac to use ONLY the integrated intel GPU and that avoids the discrete GPU issues


gfxCardStatus is a free menu bar application that keeps track of which graphics card your MacBook Pro is using at any given time.

https://gfx.io/


You can force a Macbook Pro to use the Integrated intel graphic via gfxCardStatus

.

The above does not work on Sierra and beyond, HOWEVER, this version works on High Sierra:

https://discussions.apple.com/message/32581726#32581726


https://github.com/steveschow/gfxCardStatus/releases/download/v2.4.4i/gfxCardStatus.app.zip


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Macbook Pro 8,2 keeps rebooting.

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