IBM eServer 370 xSeries, User Reference Manual

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For more information, see “LEDs for Internal hard disk drives in a ServeRAID
environment” on page 158 and “Controls and indicators” on page 7.
Power supply LEDs
The ac and dc power LEDs on the power supplies provide status information on the
power supplies. See “Power supplies” on page 13 for the location of the LEDs.
The following table describes the ac and dc power LEDs.
AC power LED DC power LED Description and action
On On The power supply is on and operating
correctly.
On Off There is a dc power problem.
Possible causes:
1. The power control button on the
front of the server is in the Off
position (the dc power LEDs on
all the power supplies are off).
Action: Press the power control
button to start the server.
2. The power supply has failed (the
dc power LED on at least one of
the power supplies is off).
Action: Replace the power
supply.
Note: If the the dc power LEDs
on all three power
supplies are off, have the
system serviced.
3. The power supply is not fully
seated in the power supply
connector.
Action: Reinstall the power
supply.
If the problem persists, have the
system serviced.
Off Off There is an ac power problem.
Possible causes:
1. There is no ac power to the
power supply.
Action: Verify that:
The power cord is properly
connected to the server.
The electrical outlet functions
properly.
2. The power supply has failed.
Action: Replace the power
supply.
If the problem persists, have the
system serviced.
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xSeries 370 User's Reference