Serial Port Error Symptoms - IBM 884155U User Manual

Note: See "System replaceable units" on page 144 to determine which components should be replaced by a field
service technician.
Symptom
The server does not turn off.

Serial port error symptoms

Note: See "System replaceable units" on page 144 to determine which components should be replaced by a field
service technician.
Symptom
The number of serial ports
identified by the operating
system is less than the number
of serial ports installed.
A serial device does not work.
130
xSeries 236 Type 8841: Hardware Maintenance Manual and Troubleshooting Guide
FRU/action
1. Verify whether you are using an ACPI or non-ACPI operating system. If
you are using a non-ACPI operating system:
a. Press Ctrl+Alt+Delete.
b. Turn off the system by holding the power-control button for 4 seconds.
c. If server fails during BIOS POST and power-control button does not work,
remove the AC power cord.
2. If the problem remains or if you are using an operating system with Advanced
Configuration and Power Management (ACPI) awareness, suspect the system
board. The procedure to check for ACPI is to locate the file named HAL.dll;
ACPI is present if the internal name HALACPI.dll appears after you right-click
on the HAL.dll file name → choose Properties → select Version tab → click
Internal Name.
FRU/action
1. Verify that:
v Each port is assigned a unique address by 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. Verify that:
v The device is compatible with the server.
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 51).
2. Failing serial device.
3. Serial adapter, if installed.
4. System board.