Can't shut down MacBook When selecting the Apple on the top bar and then 'Shut Down' or 'Restart', Finder won't show the alert that asks you to confirm that you want to restart or shut down the computer (the one with the timer). Spotlight not working, and no dots under active apps...

I tried relaunching Finder but that didn't work.

Any ideas?
You can still reboot your Mac even if the Shut Down prompt never appears: holding down the power button for at least 30 seconds will cause your Mac to force shut down, then releasing the power button and pressing and holding again until the Apple logo appears will allow you to start it up again.

If your Mac doesn't have a power button key, you can force  a shut down by pressing and holding control + option + command + eject .

Source and more info here.

tl;dr: Hold the power button for a while!