Checking PSU power is an essential step when building or troubleshooting a computer. The power supply unit (PSU) provides electrical power to all the components in the computer, so it is important to make sure that it is functioning properly. There are a few different ways to check PSU power, and the most common method is to use a PSU tester. A PSU tester is a small device that plugs into the PSU and measures the voltage and amperage output. This information can then be used to determine if the PSU is providing the correct amount of power to the computer.
It is also important to check the PSU power when troubleshooting a computer. If the computer is not turning on, or if it is experiencing random crashes, it is possible that the PSU is not providing enough power. By checking the PSU power, you can rule out the PSU as the source of the problem and focus on other troubleshooting steps.