Note the state of the light-emitting diodes (LEDs) on the power
supply. For more information, read Power supply LEDs.
If the LEDs indicate the power supply is operating normally, that is both
of the green LEDs are on solid (not blinking), continue to the next step.
If not, remove the power supply from the system and repeat the procedure starting
with step 2.
If, after repeating the procedure, the power supply is not operating normally,
contact your service provider.