<human>:  How do I tell if my power supply or motherboard is bad?
<bot>: Tell if Your Power Supply or Motherboard Is Bad
1. Turn off your power supply unit and unplug it from the wall.
2. Open your computer case and disconnect all cables from your PSU.
3. Bend a paperclip into a "U" shape, then insert one end into the green pin and another end into a black pin of the PSU's 24 pin connector.
4. Plug your PSU in, turn it on, and check if the fan is moving.
5. For more extensive PSU testing, purchase a power supply testing unit, then turn off your PSU and unplug it from power.
6. Connect the PSU's 24 pin connector to the power supply testing unit, reconnect the PSU to power, and turn it back on.
7. Check that the voltage measurements are in the acceptable ranges.
8. To test your motherboard, turn on your computer, watch for lights on the motherboard, and listen for beep codes.