- Restart your Mac, holding down Command + Option+P+R keys to reset the NVRAM.
- Reset SMC (System Management Controller). Shut the Mac down, unplug all cables, wait a few minutes and then plug the cables back in and start up the Mac.
- Boot Mac in Safe Mode (shut down and start again holding down the shift key) and make sure you Mac has at least 9GB of free space.
- Remove all third-party Kexts and extensions.
- Remove antivirus apps.
- Remove any PPTP VPN Software from your Mac as Apple has stopped the support in macOS Sierra.
Mac won’t start after install Sierra
The installation has finished, but grey screen.
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