Recently the new iMac at the Information Desk displayed a login and password screen. When this happens, restart the computer.
There are 3 ways to restart:
1. Go to the Special menu and select Restart.
2. At the login screen, click the Restart button.
3. Press and hold the power button on the rear of the iMac.
The login screen may have appeared because someone logged out. Logging out is not necessary on the iMac.