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 dust, burn marks, bulging parts, or damaged cables
Make sure all power connectors are firmly attached to the motherboard, GPU, drives, and fans
Use a PSU tester or multimeter to check output voltages
Verify the 24-pin motherboard connector and 8-pin CPU connector are properly seated
Check whether the PSU fan spins when the system is powered on
Listen for unusual noises such as clicking, buzzing, or grinding
Test the system under load to see if it shuts down, restarts, or freezes
Compare the PSU wattage to the power requirements of your components
Replace the PSU if voltages are unstable or outside normal range
Consult the PSU manual or manufacturer specifications for proper readings