How computer works

How comnputer restart itself
It is shut down and shut on again after dead
Who gives the power how does it know
Help please

IHBT, I know. power cycling is not the only way of resetting the CPU. usually, there's a reset pin which causes the CPU to reboot - and there are some ways of triggering it from software, e.g. https://en.wikipedia.org/wiki/Triple_fault