What do I do if my screen is frozen?

1. Make note of the name of the machine you are on.
2. Log into another machine
3. ssh into the machine that is frozen
4. type

pkill -9 -u your_username

5. This should log you out and kill all the processes.
The frozen terminal should return to a login screen.

If all else fails,
Contact the Math Help Desk

If it is a Windows machine:

1. Hit CTRL-ALT-DEL
Choose Shutdown, then choose Restart.