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It might sound daft, but a large proportion of problems can be cured this way. and it can save an engineer's call-out fee.
This is frequently the case when your system is otherwise up and running, but something that normally works- doesn't. For example a document won't print or a program it hangs when you try to launch it. This can be result of a 'glitch' - a temporary bug in the system possibly caused by electrical interference. Turning it off allows you to start with a clean slate.
Where possible, save any work and close down each program in turn. Some might not respond, but close what you can and try to shot down normally. Although on some occasions it might be necessary to press the power button or EVEN pull the plug!
Also, turn off any connected hardware items such as printers, monitors and CD writers, the 'glitch' may be in them.
Wait a few seconds then turn each item back on starting with monitors, printers etc., and finishing with the computer itself. If the problem still persists, explore the other options, or seek further assistance