IBM IntelliStation M Pro 6225 Hardware Maintenance Manual And Troubleshooting Manual page 104

Serial port problems
Symptom
The number of serial ports
identified by the operating
system is less than the number
of serial ports that are installed.
A serial device does not work.
Software problem
Symptom
You suspect a software
problem.
Universal Serial Bus (USB) port problems
Symptom
A USB device does not work.
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IntelliStation M Pro Types 6225 and 6228: Hardware Maintenance Manual and Troubleshooting Guide
FRU/action
1. Make sure that:
v Each port is assigned a unique address in the Configuration/Setup Utility
program and none of the serial ports is disabled.
v The serial-port adapter, if you installed one, is seated properly.
2. Failing serial port adapter.
1. Make sure that:
v The device is compatible with the computer.
v The serial port is enabled and is assigned a unique address.
v The device is connected to the correct port (see "Input/output connectors" on
page 61).
2. Failing serial device.
3. Serial adapter, if installed.
4. System board.
FRU/action
1. To determine whether problems are caused by the software, make sure
that:
v The computer has the minimum memory needed to use the software. For
memory requirements, see the information that comes with the software.
Note: If you have just installed an adapter or memory, the computer might
have a memory address conflict.
v The software is designed to operate on the computer.
v Other software works on the computer.
v The software that you are using works on another computer.
If you received any error messages when using the software, see the
information that comes with the software for a description of the messages and
suggested solutions to the problem.
2. If the problem remains, contact your place of purchase of the software.
FRU/action
Make sure that:
v You are not trying to use a USB device during POST if a standard (non-USB)
keyboard is connected to the keyboard connector. If a standard (non-USB)
keyboard is connected to the keyboard connector, the USB is disabled and no
USB device will work during POST.
v The correct USB device driver is installed.
v The operating system supports USB devices.