IBM Xseries 345 8670 Maintenance Manual page 109

Note: See "System" on page 116 to determine which components should be replaced by a field service technician.
Power problems
Symptom
The computer does not turn on. 1. Verify that:
The computer does not turn off. 1. Verify whether you are using an ACPI or non-ACPI operating system. If
Note: See "System" on page 116 to determine which components should be replaced by a field service technician.
Serial port problems
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.
For more information about the
serial port, see "Serial port" on
page 76.
FRU/action
v The power cables are properly connected to the computer.
v The electrical outlet functions properly.
v The type of memory installed is correct.
v If you just installed an option, remove it, and restart the computer. If the
computer now turns on, you might have installed more options than the
power supply supports.
2. Override front panel power button:
a. Disconnect computer power cords.
b. Reconnect power cords.
If computer turns on:
a. Operator information panel
If computer does not turn on:
v System board
3. See "Undetermined problems" on page 111.
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 computer 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 ACPI-aware operating system,
suspect the system board.
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 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 ports" on
page 73).
2. Failing serial device.
3. Serial adapter, if installed.
4. System board.
Chapter 6. Symptom-to-FRU index
99