Try starting up in 'Safe Mode'
Shut down your Mac
Start it back up and hold down the Shift Key as it's starting up.
If it starts up, do a proper shut down and then restart normally.
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When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
Try starting up in 'Safe Mode'
Shut down your Mac
Start it back up and hold down the Shift Key as it's starting up.
If it starts up, do a proper shut down and then restart normally.
Try starting up in 'Safe Mode'
Shut down your Mac
Start it back up and hold down the Shift Key as it's starting up.
If it starts up, do a proper shut down and then restart normally.
Before attempting to start in Safe Mode try an NVRAM reset the directions are simple and are explained in How to reset NVRAM or PRAM on your Mac - Apple Support
Why my Mac can’t turn on ?