What should you ensure or do before starting a computer?

Before starting up your computer follows these steps:
1. Attach the power cables to the system unit and monitor
2. Attach the display cable to the monitor and the system unit.
3. Attach the power cables of the system unit and monitor to the main power supply.
4. Turn the main power supply on. the system is ready to start up.

How do you turn your computer on?
follows these steps that turn the computer on:
1. Turn the LCD/monitor on by pressing its power button.
2. Press the power button on the system unit. the computer starts up.