IBM eserver xSeries 440, Troubleshooting Manual

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Chapter 2. Solving Problems
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server again to be able to use the Light Path Diagnostics lights to help locate system
errors.
To view the lights on the various system boards:
1. Turn off the server and peripheral devices.
2. Press and hold the Light Path Diagnostics (blue) button on the diagnostics panel.
The lights will be illuminated while the switch is pressed.
Note: You can illuminate the lights for a maximum of 2 minutes. After that time,
the circuit that powers the lights is exhausted.
3. Close the server cover; then, reinstall the server in the rack and connect all
external cables.
Light Path Diagnostics panel
The following illustration shows the lights on the diagnostics panel on the system
board. See “Light Path Diagnostics table” for information on identifying problems using
these lights.
Light Path Diagnostics table
The system-error light on the operator information panel is lit when certain system
errors occur. If the system-error light on your server is lit, use the following table to
help determine the cause of the error and the action you should take.