Mac frozen at grey screen at start up. OS will not load. Any Tips?

I Have attempted to recover. I have also checked disk integrity and safe mode start. Nothing will keep it from hanging during the boot up process. A grey screen displays after the status line gets halfway at boot

SilveyBerry,
1. Hold down the Power Button and both volume buttons at the same time for 15 seconds and then wait 1 minute. Then hold down the power button only until the red light flashes then release it and wait for the PB to reboot which will be about 4 minutes. Make sure you got all the buttons at the same time, it can be difficult to do.
2. When it reboots, tap the gear icon in the top right corner and scroll down to Security. Perform a Security Wipe of the PB. You will lose all files you have added to the PB. Since this is a new unit, you likely do not have any files on it.
3 When you get the Security Wipe done, tap the Battery icon,  tap restart.  Let me know when you are at this point because there is another procedure to carry out. I will have to find it and I will post it here.

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