1. Visual inspection
The first step in troubleshooting a bad power supply is to do a visual inspection. Inspect the exterior of the power supply for any signs of physical damage such as bulging capacitors, melted wires, dents or scratches. If the power supply appears to be damaged, it is best to replace it as it may be unsafe to use.
2. Check connections
Check to make sure all the power connections are secure and properly connected. Make sure that the power cord is firmly plugged into both the wall outlet and the back of the power supply. If you have an adapter or cable connected to the power supply, make sure that it is properly seated in the socket.
3. Power on
Turn on the power switch on the power supply and make sure that the fan is running. If the fan is not spinning, then the power supply will not be able to dissipate heat and could overheat and catch fire. Also, check to make sure that all LED indicators are properly lit up and that you hear a faint hum or buzzing noise as this indicates that the power supply is working correctly.
4. Testing the voltage output
If after visually inspecting and checking the connections the power supply still does not work, it may be necessary to check the output voltage. To do this, use a multi-meter to measure the output voltage from the power supply on each of the voltage rails. If the voltage is outside of the normal range or not consistent with the labels on the side of the power supply, then it is likely that the power supply has failed.
5. Replace components
In some cases, it may be possible to replace specific components to get the power supply working again. This should only be done if you have the skills and knowledge to safely do so. It is important that you use the correct components and make sure that you are familiar with basic electronics safety measures before attempting to repair the power supply.
6. Replace the power supply
If all else fails, it may be necessary to replace the power supply. Make sure to get one that meets the specifications of your system and is compatible with your other components. It is also important to make sure that the new power supply is rated for adequate power for your system’s requirements.