Identifying Problems Using Status Leds; Light Path Diagnostics; Power Supply Leds - IBM xSeries 150 User Reference Manual

Identifying problems using status LEDs

Light path diagnostics

complete, the message Recovery complete, remove the diskette and return
boot block switch to the off position before rebooting is displayed.
6. Remove the flash diskette from the diskette drive.
7. Turn the server off.
8. Remove the jumper on the boot-block jumper block or move it to pins 1 and 2 to
return to normal startup mode.
9. Restart the server. The system should start up normally.
If the System Error light in the operator information panel on the front of the server is
on, one or more LEDs inside the server or on the power supplies will be on. Use the
light path diagnostics to identify the type of error that occurred.
You can use the light path diagnostics built into your server to quickly identify the
type of system error that occurred. Your server is designed so that any LEDs that are
illuminated remain illuminated when the server shuts down as long as the AC power
source is good and the power supplies can supply +5V dc current to the server. This
feature helps you isolate the problem if an error causes the server to shut down. See
"Light path diagnostics table" on page 97.

Power supply LEDs

The AC and DC Power LEDs on the power supply provide status information about
the power supply.
The following table describes the AC and DC Power LEDs.
DC power
LED (green)
AC power
LED (green)
Chapter 4. Solving Problems
95