From HPL IT HelpDesk, 2:46pm:
Before closing please leave the public computers powered on but the monitors powered off. It is important to keep the computers on so they can receive critical updates. Turning the monitors off helps save on electricity costs and also prolongs the life of the screens.
We realize that some of our public computers are “all-in-one” units and thus the monitor can’t be turned off while leaving the computer on. For these leave the entire unit powered on at night.
Thanks for your cooperation and if you have any questions contact the Help Desk.