Anyone who works with computer maintenance remembers that classic scene from The IT Crowd: "Have you tried turning it off and on again?" Beyond the joke, this action's effectiveness is impressive, and it applies to mobile devices, routers, printers, consoles, TVs... the list goes on. So, why? Why does restarting your PC fix so many problems?
The first step is to understand the errors that lead to an unstable situation. Many of these errors can be avoided, contained, and/or corrected to a certain extent (in fact, there are dedicated hardware components like ECC memory), but some instances are truly unrecoverable and take the whole computer down with them.
If Windows tries to access a piece of code that isn't there, you'll likely get a blue screen. If a process triggers the execution of several threads that devour RAM, the operating system will try to compensate by moving more data to virtual memory, but it makes the whole environment slower.
The Miracle Restart
The video from TechQuickie uses the analogy of a car trip. If you need to travel from point A to point B using the main route but it's blocked by an accident, there's the possibility of taking an alternative path (even if it's a bit longer) and continue the journey. However, if that or other secondary roads collapse similarly, only one option remains: Return to the beginning and trace a new route from scratch.
Restarting your PC symbolizes that "return". There are also times when an error is partial or "soft". If a program encounters a major problem, it might be smart enough to close itself and avoid further conflicts, but there are special conditions (say, infinite loops and memory leaks) that will make the computer a little slower each time, until it falls to its knees. The general restart helps us escape those traps.
Now, what happens when restarting your PC is not enough, and the underlying problem persists? Many errors are exactly repeatable and require more advanced diagnostics. At the same time, we cannot ignore the hardware factor. Excessive heat, a faulty power supply, hard drives about to throw in the towel, and memory modules with physical errors devour stability, and in those cases, no restart is worth it.
