Unable to Log in to Guest user or restart Laptop

Thank you for your reply. My problem is now solved, thank you. I did as you instructed and the Guest User window is the same as the one you posted above. The 'Allow guests to log in to this computer' was checked, so I unchecked it, logged out, logged back in again and checked it and evrything returned to normal. I can now log in to Guest User without a password. So the mystery is why I needed a password before when the ''Allow guests to log in to this computer' was checked?

Anyway all is sorted now, and I really appreciate your time on this, I know it is all voluntary.

Cheers..

Thank you for you reply. In my case if I click on my name at the top right of the screen the orange ticks indicate that both Guest User and I are logged in. If I click on Guest User it takes me to the log in screen where there is an empty box requesting that I enter a pasaword in order to log in to guest User, but as stated I don't know the password as I didn't set one up. Hence I can't restart my laptop as other people are logged in, but I cannot see a way to log them out.

I am using El Capitan 10.11.6 on a Late 2011 MBP.

Any help would be really appreciated.

Hello, I have an update on this issue.

In regards to restarting my laptop I realised I was using the wrong username. I was using the name that appears in the Users & Groups window, when in actual fact I should have been using the name of the home folder. When I put the Home Folder Name & password in the 'others logged into this computer..' window my laptop restarted.

Now when I go to the Users & Groups window I am logged out of 'Guest User' and it is not greyed out. However, when I click on 'Guest User' I am taken to the login screen where a password is still required. I understand that there should be no need for a password for 'Guest User' log in, but in my case there does appear to be one needed.

Any suggestions would be appreciated...