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Mac won’t start after install Sierra

The installation has finished, but grey screen.
  1. Restart your Mac, holding down Command + Option+P+R keys to reset the NVRAM.
  2. 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.
  3. 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.
  4. Remove all third-party Kexts and extensions.
  5. Remove antivirus apps.
  6. Remove any PPTP VPN Software from your Mac as Apple has stopped the support in macOS Sierra.

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