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Your server is designed so that any LEDs that have illuminated, can be illuminated
again without ac power after you open the cover. This feature helps you isolate a
problem if an error causes the server to shut down. See "Light Path Diagnostics table"
on 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; then, disconnect all external cables
from the server.
2. Slide the server out of the rack cabinet.
3. Open the top cover.
4. 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.
5. Close the cover on the server; then, slide the server into the rack cabinet and
connect all external cables. For more information, see "Completing the installa-
tion" on page 29 for instructions.
The following illustration shows the LEDs on the diagnostics panel on the system
board. See "Light Path Diagnostics table" on page 55 for information on identifying
problems using these LEDs.
Chapter 5. Solving problems
53
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