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Macbook Pro - GPU panic fix

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Macbook Pro (2013) Can't Boot. I face these issueblack screen, can't bootunexpect shutdown or restart
I found the problem may from GPU (macos gpu panic). If you face the issue, 
Please clear clear NVRAM or SMC then Disable auto switch GPU and install software gfxCardStatus to force to use integrated only (Intel HD Graphic).


Clear NVRAM (from https://goo.gl/VL5cV6)Shut down your Mac.Press the power button, and as soon as you hear the startup chime, hold down Command-Option-P-R.Keep holding down those keys until you hear a second startup chime. Then let go and allow your Mac to continue starting normally.Then check the Startup Disk, Display, and Date & Time panes of System Preferences to make sure they’re set the way you want them.

Clear SMC (from https://goo.gl/Jbqj7z)
Choose Apple menu > Shut Down.After your Mac shuts down, press Shift-Control-Option on the left side of the built-in keyboard, then press the power button at the same time. Hold these keys and the power button …