IBM eServer xSeries 440 Installation Manual page 55

Important: You have up to 12 hours to use the Light Path Diagnostic LEDs after ac
power has been removed from the server. After 12 hours, you must power-on the
server again to be able to use the Light Path Diagnostic LEDs to help locate system
errors.
To view the LEDs when the server cover has been opened:
1. Turn off the server and all peripheral devices.
2. Press and hold the Light Path Diagnostics (blue) button on the diagnostics
panel. The LEDs will be illuminated while the button is pressed.
Note: You can illuminate the LEDs for a maximum of two minutes. After that
time, the circuit that powers the LEDs is exhausted.
3. Replace the cover on the server; then, reinstall the server in the rack and
connect all external cables. For more information, see "Completing the
installation" on page 24 for instructions.
The following illustration shows the LEDs on the diagnostics panel on the system
board. See "Light Path Diagnostics table" on page 47 for information on identifying
problems using these LEDs.
Solving problems
Chapter 5. Solving problems
45