IBM 8676 - Eserver xSeries 335 Hardware Maintenance Manual And Troubleshooting Manual page 104

Note: See "System" on page 112 to determine which components should be replaced by a field service technician.
Power problems
Symptom
The server does not turn on.
The server does not turn off.
Note: See "System" on page 112 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.
94
xSeries 335 Type 8676, Type 8830: Hardware Maintenance Manual and Troubleshooting Guide
FRU/action
1. Verify that:
v The power cables are properly connected to the server.
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 server. If the server
now turns on, you might have installed more options than the power supply
supports.
2. If LEDs for CPUs or VRMs are on, verify that:
a. A VRM is installed if a second microprocessor is present.
b. All microprocessors have the same speed.
3. Override front panel power button:
a. Disconnect server power cords.
b. Install a jumper on the force power-on jumper J27 (The J27 jumper is
located about 2 inches to the right of J28 and has "FO" silk-screened to the
front of it.).
c. Reconnect power cords.
If server turns on:
a. Service processor error.
b. Operator information card.
If server does not turn on:
a. Power supply
b. System board
4. See "Undetermined problems" on page 109.
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 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.