What you need
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1) Boot Macbook with keys pressed: Command (plus) S
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2) Wait for active command line
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3) Enter these 3 commands:
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nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00
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nvram boot-args="-v"
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reboot
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System should boot without issues.
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7 Comments
After nearly 2 weeks internet research, at last a working solution. Heureka! Thanx a lot!
Best regards,
Chris
This post worked !!!! Thank you so much. I joined IFIXit because of this post.
Key phrase: Boot. I can’t boot my machine. I’m stuck on the white screen of death. It sometimes is pink and other times the external monitor is green. I did all the resets on the Apple side (to PRAM, SMC, etc.), I tried to restore the OS (didn’t work) and I tried to use a different computer to create a working boot drive (USB) and can’t seem to get the command correct for Sierra or High Sierra. The USB Boot I created with Mojave on it could be seen in the Repair boot process but the machine simply shut down mid processing. So I can’t do the entry of the code because I can’t boot or find a terminal or be in verbose mode to do so. My 2011 15” Macbook Pro is running Sierra (was) and I have data on it I very much need - in addition to wanting to see my screens again.
