What should you check for if a desktop is not powering on?

When a desktop is not powering on, the first step is to check the power cable connection and test the power supply. The power supply is a crucial component that converts electrical power from an outlet into the correct voltage and current for the computer's components. If the power supply is not working properly, the system will not turn on regardless of the functionality of other components.

Ensuring that the power cable is securely connected to both the power outlet and the back of the desktop is essential, as a loose or damaged cable can prevent power from reaching the system. Additionally, testing the power supply involves using a multimeter or power supply tester to verify that it is delivering the correct voltages. If the power supply is faulty, it must be replaced.

The other options, while relevant in different scenarios, do not directly address the immediate issue of the desktop failing to power on. For example, verifying that the monitor is functioning or checking peripheral connections will not resolve powering issues related to the desktop itself. Similarly, ensuring that all software is up to date is a maintenance task that becomes relevant only after the hardware has been successfully powered on.