I have a Macbook Air A1465 that was having some issues with Teamviewer, so I used the terminal to remove all teamviewer files with the following command
for x in $(mdfind -name "teamviewer"); do rm $x; done
Now on startup, all I get is a black screen with the loading spinner, but I can't power off the Mac by holding the power button for 10 seconds. The mouse cursor flashes up every now and then, but that's the only sign of life apart from the spinner.
Is there any other way to power off the Macbook besides waiting for the battery to run dry?