What should be checked if a computer does not power on?

When a computer does not power on, one of the essential steps in troubleshooting is to check the power supply connection and internal components. The power supply is responsible for providing electricity to all the internal parts of the computer, including the motherboard, CPU, and other peripherals. If the power supply isn’t properly connected or is malfunctioning, the computer will not turn on.

Additionally, inspecting internal components such as the RAM, graphic card, and other connections is crucial. Loose cables or faulty hardware can prevent a computer from powering up. Ensuring all connections are secure and functional is therefore a critical initial troubleshooting step.

Other options, such as checking the brightness settings of the monitor, are not relevant in this situation, as they assume the computer is powered on and merely affecting the display. Similarly, examining software applications or the type of operating system pertains to issues that arise when a computer is operational but experiencing problems, rather than addressing a complete failure to power on.