A power supply unit (PSU) is a computer component that supplies power to the other components in a computer case. A power supply unit is essential for powering on a computer and allowing it to function properly. If the power supply unit is not working correctly, it can cause a computer to not turn on, or it can cause the computer to shut down unexpectedly.
There are a few different ways to check if a power supply unit is working properly. One way is to use a multimeter to test the voltage output of the power supply unit. Another way is to use a power supply tester to test the power supply unit’s functionality.