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Intermittent problems
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See the parts listing in the Hardware Maintenance Manual to determine which components are customer
replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Symptom
A problem occurs only
occasionally and is difficult to
diagnose.
USB keyboard, mouse, or pointing-device problems
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See the parts listing in the Hardware Maintenance Manual to determine which components are customer
replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Symptom
All or some keys on the
keyboard do not work.
Action
1. Make sure that:
v All cables and cords are connected securely to the rear of the server and
attached devices.
v When the server is turned on, air is flowing from the fan grille. If there is no
airflow, the fan is not working. This can cause the server to overheat and
shut down.
2. Check the system-error logs (see "Using the Configuration/Setup Utility
program" on page 35).
Action
1. See http://www.lenovo.com/accessories for keyboard compatibility.
2. Make sure that:
v The keyboard cable is securely connected.
v The server and the monitor are turned on.
3. Move the keyboard cable to a different USB connector.
4. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. Keyboard
b. (Only if the problem occurred with a front USB connector) Internal cables to
the operation information panel
c. (Only if the problem occurred with a front USB connector) Operator
information panel
d. (Trained service technician only) System board
Chapter 5. Solving problems
47
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