Computers are multiple layers of massive complexity. Somewhere in that complex stack it's very easy for 'something' to go wrong.
When it's first turned on the computer works, so it's clear that there's an initial 'state' where all those layers of complexity are in alignment. Turning it off and on again is the best way to try and replicate that initial successful state.
👤 ohiovr
Depends on when it is made. Anything made before 2003 is still broken when you turn it on again.