MacBook restart

Due to there being more than a few variations in hardware and system (issues)

there may (or not) be a resolution to the symptom of your Mac problem here:

• A Solution for MacBook/Pro Booting to a Black Screen - osxdaily

https://osxdaily.com/2014/11/22/fix-macbook-pro-booting-black-screen/

• If your Mac doesn't start up all the way - Apple Support

https://support.apple.com/en-us/HT204156

"..If your Mac doesn't start up all the way, or needs you to do some

thing during startup ~ it might stop at one of these screens.."

A few basic things to try, with any MacBook model (except M1 silicon)

as those usually require a minimal -to maximum- effort to try & restart.

Be sure the MacBook is actually 'off'. Press and Hold the power button

down, to be sure its not just pretending to be off; or maybe its a coma

like state. 15-25 seconds should do. Either way, be sure it really is Off.

The unit may respond to PRAM reset on startup, if it can; that involves

holding four keys and the power button at once. If that works, it would

make Chime sound; hold those keys until Chime sounds, 2 or 3 times.

SMC reset? This also could be used on a restart by holding keys down.

(Be sure the macbook has a working power adapter; and plugged in

awhile to be sure it has AC power into the DC circuitry.)

The older 2014 article has some good ideas still relevant today.

• How to reset the SMC of your Mac - Apple Support

https://support.apple.com/en-us/HT201295

Resetting the SMC doesn't affect the contents of NVRAM or PRAM.

(This NVRAM reset could help with overall troubleshooting efforts.)

• Get help with your Mac notebook battery - Apple Support

https://support.apple.com/en-us/HT204054

• 7 Mac Startup Options Every Mac OS X User Should Know - alphr.com

https://www.alphr.com/mac-startup-options/

Could be the battery and charging system has compound failures.

Or if hard drive totally fails, the Mac would be unlikely to function.