Testing a power supply is an important step in troubleshooting many problems, most obviously when your computer has trouble booting. However, a failing power supply can often be the source of problems you don’t expect, such as random lockups, spontaneous reboots, and even some serious error messages.
How to Test a PC Power Supply | Jumper Wire, PSU Tester & Multimeter
Ask any computer repair person and they will probably tell you that the power supply is the most common piece of hardware to fail in a computer. It is often the first thing to fail as a computer ages.
You can test it yourself manually with a multimeter (method #1) or you can purchase a power supply tester to perform an automatic PSU test (method #2).
Both methods are equally effective, so which one you choose is entirely up to you.
