Serial-Device Problems - Lenovo x3550 M4 Installation And Service Manual

v Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
v If an action step is preceded by "(Trained technician only)," that step must be performed only by a trained
technician.
v Go to the support website at http://www.ibm.com/supportportal/ to check for technical information, hints, tips,
and new device drivers or to submit a request for information.
Symptom
The server does not turn off.
The server unexpectedly shuts
down, and the LEDs on the
operator information panel are
not lit.

Serial-device problems

Use this information to solve serial-device problems.
v Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
v If an action step is preceded by "(Trained technician only)," that step must be performed only by a trained
technician.
v Go to the support website at http://www.ibm.com/supportportal/ to check for technical information, hints, tips,
and new device drivers or to submit a request for information.
Symptom
The number of serial ports that
are identified by the operating
system is less than the number
of installed serial ports.
Action
1. Determine whether you are using an Advanced Configuration and Power
Interface (ACPI) or a non-ACPI operating system. If you are using a non-ACPI
operating system, complete the following steps:
a. Press Ctrl+Alt+Delete.
b. Turn off the server by pressing the power-control button and hold it down
for 5 seconds.
c. Restart the server.
d. If the server fails POST and the power-control button does not work,
disconnect the power cord for 20 seconds; then, reconnect the power cord
and restart the server.
2. If the problem remains or if you are using an ACPI-aware operating system,
suspect the system board.
See "Solving undetermined problems" on page 172.
Action
1. Make sure that:
v Each port is assigned a unique address in the Setup utility and none of the
serial ports is disabled.
v The serial-port adapter (if one is present) is seated correctly.
2. Reseat the serial port adapter.
3. Replace the serial port adapter.
Chapter 4. Troubleshooting
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