Mac High Sierra inactive mouse click selecting user
I tried to access my remote iMac running High Sierra. I can see the OS user names but I can't select them. The mouse is active and login and logout of the computer goes normal also receiving the same alerts as a regular active deactive access.
How can I force access to the Mac. File remote access returns the message that it was rejected by the user or that the computer is not active.
I did not try Force Quit because I don't know the result, if it is going to logout, reboot or shut down the remote computer, if the latter, I can afford to totally loose contact.
Is there a way to reboot the computer? I can't find that option available.