The Xbox 360 power supply light is red.
The external power supply has detected a fault. The power supply has several built-in safeguards to help prevent damage to either the console or to the power supply itself. The power supply will turn itself off under the following conditions:
- When there is too much current
- When the voltage is too high
- When the temperature is too high
Under these conditions, the light on the power supply will turn from green to orange or to red. Or, the light will turn off. When the power supply light is green or orange when it is connected to the wall outlet, the power supply is functioning correctly.