Memory Problems; Microprocessor Problems; Monitor Problems - IBM IntelliStation A Pro 6224 User Manual

Memory problems

Symptom
The amount of system memory
displayed is less than the
amount of physical memory
installed.

Microprocessor problems

Symptom
The computer emits a
continuous tone during POST.

Monitor problems

Some IBM monitors have their own self-tests. If you suspect a problem with your
monitor, see the information that comes with the monitor for instructions for testing
and adjusting the monitor. If you cannot diagnose the problem, call for service.
Symptom
The screen is blank.
Only the cursor appears.
The monitor works when you
turn on the computer, but the
screen goes blank when you
start some application
programs.
Suggested action
v Make sure that:
– The DIMMs are seated correctly.
– You have installed the correct type of memory.
– If you changed the memory, you updated the memory configuration with the
Configuration/Setup Utility program.
– All banks of memory are enabled. The computer might have automatically
disabled a memory bank when it detected a problem, or a memory bank
could have been manually disabled.
v Check POST error log for error message 289:
– If the DIMM was disabled by a system-management interrupt (SMI), replace
the DIMM.
– If the DIMM was disabled by the user or by POST, run the
Configuration/Setup Utility program and enable the DIMM.
If the problem remains, call for service.
Suggested action
The startup (boot) microprocessor is not working correctly. Call for service.
Suggested action
Make sure that:
v The computer power cord is connected to the computer and a working electrical
outlet.
v The monitor cables are connected correctly.
v The monitor is turned on and the brightness and contrast controls are adjusted
correctly.
If the problem remains, call for service.
Call for service.
Make sure that:
v The application program is not setting a display mode higher than the capability
of the monitor.
v The primary monitor cable is connected to the video port.
v You have installed the necessary device drivers for the application programs.
If the problem remains, call for service.
Chapter 5. Solving problems
89