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Universal Serial Bus (USB) port problems
Use this information to USB port problems.
Table 19. Universal Serial Bus (USB) port problems and actions
• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• If an action step is preceded by "(Trained technician only)," that step must be performed only by a trained
technician.
• Go to the Support Web site at http://www.lenovo.com/support to check for technical information, hints,
tips, and new device drivers or to submit a request for information.
Symptom
A USB device does not work.
Video problems
Use this information to solve video problems.
See "Monitor and video problems" on page 68.
Solving power problems
Use this information to solve power problems.
Power problems can be difficult to solve. For example, a short circuit can exist anywhere on any of the
power distribution buses. Usually, a short circuit will cause the power subsystem to shut down because of
an overcurrent condition. To diagnose a power problem, use the following general procedure:
Step 1.
Turn off the server and disconnect all power cords.
Step 2.
Check for loose cables in the power subsystem. Also check for short circuits, for example, if a
loose screw is causing a short circuit on a circuit board.
Step 3.
Check for any errors indicated by the operator information panel or LCD operating panel assembly
(see "Operator information panel" on page 15 or "LCD operating panel assembly" on page 15 ).
Step 4.
If the check log LED on the operator information panel is lit, check the IMM event log for faulty Pwr
rail and complete the following steps. Table 20 " Components associated with power rail errors"
on page 78 identifies the components that are associated with each Pwr rail and the order in
which to troubleshoot the components.
a.
Disconnect the cables and power cords to all internal and external devices. Leave the
power-supply cords connected.
b.
For Pwr rail 1 error, complete the following steps:
1. (Trained technician only) Replace the system board.
2. (Trained technician only) Replace the microprocessor.
c.
For other rail errors (Pwr rail 1 error, see step 4b), remove each component that is associated
with the faulty Pwr rail, one at a time, in the sequence indicated in Table 20 " Components
Action
1. Make sure that:
• The correct USB device driver is installed.
• The operating system supports USB devices.
2. Make sure that the USB configuration options are set correctly in the Setup
Utility (see "Using the Setup Utility" on page 31 for more information).
3. If you are using a USB hub, disconnect the USB device from the hub and
connect it directly to the server.
.
Chapter 3
Troubleshooting
77
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Table of Contents
Troubleshooting
