There are two types of booting a computer: a cold boot which starts the machine from an off state, and a warm boot which resets the system after it has been running. To cold boot, turn on the monitor, peripherals, system unit, and wait for startup. To warm boot or restart, exit all programs, click start and select restart. To shut down, exit all programs, click start and select turn off, then turn off peripherals, monitor, and power once the computer indicates it is safe to do so.