Answer:
There is a short circuit in a component in the power circuit.
Explanation:
The power circuit in a computer system, regulates, rectifies and steps down power and voltage entering the main motherboard.
When a power surge capable of damaging the motherboard occurs, A component in the power circuit is shorted, not allowing the dangerous power to pass.
This can be troubleshooted by passing a high current, since the shorted component has a high emf. It over heats and is detected and changed.