Universal Serial Bus (Usb) Port Problems; Solving Power Problems; Solving Ethernet Controller Problems - Lenovo ThinkServer RD240 Installation And User Manual

Universal Serial Bus (USB) port 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 (CRUs) and which components are field replaceable units (FRUs).
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 USB device does not work.

Solving 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
3. Remove the adapters and disconnect the cables and power cords to all internal
4. Reconnect all ac power cords and turn on the server. If the server starts
If the server does not start from the minimum configuration, replace the
components in the minimum configuration 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 file.
Try the following procedures:
v Make sure that the correct device drivers, which come with the server, are
v Make sure that the Ethernet cable is installed correctly.
Action
1. Make sure that:
v The correct USB device driver is installed.
v The operating system supports USB devices.
v 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 configuration 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.
example, if a loose screw is causing a short circuit on a circuit board.
and external devices until the server is at the minimum configuration that is
required for the server to start (see "Solving undetermined problems" on page
102 for the minimum configuration).
successfully, replace the adapters and devices one at a time until the problem is
isolated.
installed and that they are at the latest level.
Chapter 7. Troubleshooting
101