IBM x3630 M3 7377 - Power-Supply Leds

Power-supply LEDs
The following illustration shows the locations of the power-supply LEDs.
AC
DC
AC
DC
AC power
LED
DC power
LED
Power-supply
error LED
AC
DC
The following table describes the problems that are indicated by various
combinations of the power-supply LEDs and suggested actions to correct the
detected problems.
58 IBM System x3630 M3 Type 7377: Problem Determination and Service Guide