eli5: How does “restart” work? when a device, e.g. windows PC is turned off, how does in know to turn itself back on?

Question

Edit: Typo in title🤦‍♀️

How does it* know to turn itself back on?

In: 114

Answer 1

Each computer has a sort of program (called bootstrap) that starts a sequence of instructions which identify and initialize all components of a PC such as the CPU, Motherboard, RAM, etc.