IBM IntelliStation A Pro 6224 Hardware Maintenance Manual And Troubleshooting Manual page 108

Note: See Chapter 7, "Parts listing, Type 6224," on page 107 to determine which components are replaceable by the
customer (CRU), and which components must be replaced by a field service technician (FRU).
Symptom
The computer does not turn on. 1. Verify that:
The computer does not turn off.
Note: See Chapter 7, "Parts listing, Type 6224," on page 107 to determine which components are replaceable by the
customer (CRU), and which components must be replaced by a field service technician (FRU).
Symptom
The number of serial ports
identified by the operating
system is less than the number
of serial ports installed.
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IntelliStation A Pro Type 6224: Hardware Maintenance Manual and Troubleshooting Guide
Power problems
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. If LEDs for microprocessors 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 computer power cords.
b. Install a jumper on the force power-on jumper (J27).
c. Reconnect power cords.
If computer turns on:
a. Service processor (baseboard management controller) error.
b. Operator information card.
If computer does not turn on:
v System board
4. See "Undetermined problems" on page 104.
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 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.
Serial port problems
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.