IBM eServer xSeries 345 Type 8670, Maintenance Manual

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power LEDs.
DC power LED
(green) AC power LED
(green)
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 server is not turned on (the power LED is flashing on the front of
the server).
Action: Press the power-control button to start the server.
2. The power supply has failed.
Action: Replace the power supply.
Off Off There is an ac power problem.
Possible causes:
1. There is no ac power to the power supply.
Actions: Verify that:
v The electrical cord is properly connected to the server.
v The electrical outlet functions properly.
2. Disconnect the ribbon cable from connector J25 on the system board. If
the AC power LED comes on, see “Undetermined problems” on
page 111.
3. The power supply has failed.
Action: Replace the power supply.
Light Path Diagnostics
If the system error LED on the front of the server is on, one or more LEDs inside
the server might be on. Use the Light Path Diagnostics panel to quickly identify the
type of error that occurred.
For LED locations see “System-board LED locations” on page 49.
Your server is designed so that LEDs remain illuminated when the server shuts
down, as long as the power supply is operating properly. This feature helps you to
isolate the problem even if an error causes the server to shut down.
Diagnostic panel LEDs
The following illustration shows the LEDs on the diagnostics panel inside the server.
See “Light Path Diagnostics table” on page 34 for information about identifying
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xSeries 345 Type 8670: Hardware Maintenance Manual and Troubleshooting Guide