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MacBook Pro 15" Unibody Mid 2012 Disable 2nd GPU to prevent white screen or green stripes during boot process

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1) Boot Macbook with keys pressed Command + S

2) Wait for active command line

3) Enter these 3 commands:

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

nvram boot-args="-v"

reboot

System should boot without issues.

Source: https://forums.macrumors.com/threads/for...

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