Turning a computer off at the end of the day--PC, supermicro or mini--isn't always the right thing to do. Computers don't have moving parts other than the disk drives and printer that are subject to wear and tear. This means constantly leaving a computer on won't wear it out. However, a computer can be damaged by a fluctuation in the amount of electrical charge flowing through it. Turning a computer on and off creates a significant change in current flow, which, over time, can erode the computer's circuits. As long as a computer is plugged into a good surge protector, it may be left on--even overnight and during weekends. To avoid images being burned into the screens, turn the screens down or off. Most newer screens have been designed to protect against such an occurrence by automatically turning off when the terminal or PC has not been used for a period of time.
https://librarytechnology.org/document/4813/