In this video, we'll show you how to reconnect and test the power cables one at a time. Before you begin, please consult your device's user manual to learn how to properly remove the components and follow the safety precautions. Unplug the power cable and press the power button for 10 seconds.
Reconnect the cables from the power supply unit to the internal devices one at a time. Connect the power cord to the PSU and press the PSU built-in self test button.
Check if the LED lights up. If it does, disconnect the power cable and continue testing with the next motherboard power cable. If the LED does not light up, move on to the next step.