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Universal Serial Bus (USB) port problems
• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• See Chapter 5 "Parts listing, Lenovo System x3300 M4 Type 7382" on page 159 to check if a component is a
structural, or FRU part.
• If an action step is preceded by "(Trained technician only)," that step must be performed only by a trained
technician.
Symptom
A USB device does not work.
Video problems
See "Monitor and video problems" on page 141.
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:
1. Turn off the server and disconnect all ac power cords.
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.
3. If the Check-log LED on the operator information panel is lit, complete the following steps:
• Check the IMM2 event log. To access the web interface, see "Logging on to the Web interface" on
page 105.
• If a log indicates that there is a power rail failure, find the location of the failed power rail on the power
paddle card.
• Disconnect the cables and power cords to all internal and external devices (see "Internal Cable
Routing and Connectors" on page 172). Leave the power-supply cords connected.
• Remove each component that is associated with the failed power component, one at a time,
restarting the server each time, until the cause of the failure is identified.
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System x3300 M4 Installation and Service Guide
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 95 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.
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Table of Contents
Troubleshooting
