Turn off the computer and unplug it from the wall
Open the case and locate the PSU
Check the PSU label for wattage, voltage, and amperage ratings
Inspect the PSU for physical damage, dust buildup, or burnt smells
Verify all power cables are firmly connected
Use a PSU tester to check voltage outputs
Use a multimeter to test the 24-pin, CPU, and PCIe connectors
Check BIOS or software for voltage readings
Compare the PSU wattage to your system’s power requirements
Test the computer with a known-good PSU if problems persist