The Power Supply Unit (PSU) is the heart of your computer. It pumps life (electricity) into every other component. When the PSU starts to fail, symptoms can be confusing: random shutdowns, failure to boot, or mysterious crashes during gaming.
This is the most basic test to see if the PSU is completely fried. check power supply on pc
Turn off your PC, unplug the PSU, and shine a flashlight into the fan grill on the back. The Power Supply Unit (PSU) is the heart of your computer