Try restarting in Safe mode by holding down the Shift key while booting.
If that does no good, perhaps you should take it in to the Apple store for a checkup. Contact - Official Apple Support
Try restarting in Safe mode by holding down the Shift key while booting.
If that does no good, perhaps you should take it in to the Apple store for a checkup. Contact - Official Apple Support
Yes. Turn it off from the power button and restart in Safe mode.
Also, see this article. If your Mac won't turn on - Apple Support
Do I have to restart my conputer to reboot it
My MacBook Pro had its screen go blank while using