PS LED lights up

The PS LED on the light path diagnostics panel lights up when power supply 1 or power supply 2 fails.

Troubleshooting steps

Procedure

Check the power supply LEDs for an error indication. For example, AC LED and DC LED do not both light up.
Make sure that the power supplies are seated correctly.
Remove one of the power supplies to isolate the failed power supply.
Replace the failed power supply.