Filter
Top Products
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 the parts listing in the Hardware Maintenance Manual to determine which components are customer
replaceable units (CRUs) and which components are eld replaceable units (FRUs).
• If an action step is preceded by “(Trained service technician only),” that step must be performed only by
a trained service technician.
Symptom Action
A USB device does not work.
1. Make sure that:
• The correct USB device driver is installed.
• The operating system supports USB devices.
• A standard PS/2 keyboard or mouse is not connected to the server. If it is, a
USB keyboard or mouse will not work during the POST.
2. Make sure that the USB conguration optional devices are set correctly in the
Setup Utility program.
3. If you are using a USB hub, disconnect the USB device from the hub and
connect it directly to the server.
Solving power problems
Power problems can be difcult 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. Remove the adapters and disconnect the cables and power cords to all internal and external devices
until the server is at the minimum conguration that is required for the server to start (see “Solving
undetermined problems” on page 97 for the minimum conguration).
4. Reconnect all ac power cords and turn on the server. If the server starts successfully, replace the
adapters and devices one at a time until the problem is isolated.
If the server does not start from the minimum conguration, replace the components in the minimum
conguration one at a time until the problem is isolated.
Solving Ethernet controller problems
The method that you use to test the Ethernet controller depends on which operating system you are using.
See the operating-system documentation for information about Ethernet controllers, and see the Ethernet
controller device-driver readme le.
Try the following procedures:
• Make sure that the correct device drivers, which come with the server, are installed and that they are at
the latest level.
• Make sure that the Ethernet cable is installed correctly.
– The cable must be securely attached at all connections. If the cable is attached but the problem
remains, try a different cable.
– If the Ethernet controller is set to operate at 100 Mbps, you must use Category 5 cabling.
96 ThinkServer Installation and User Guide