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Memory problems
Memory symptom
The amount of system memory
displayed is less than the
amount of physical memory
installed.
Microprocessor problems
Microprocessor symptom
The computer emits a
continuous tone during POST.
(The startup (boot)
microprocessor is not working
properly.)
Monitor problems
Monitor symptom
Testing the monitor.
The screen is blank.
Suggested action
1. Verify that:
v The memory modules are seated properly.
v You have installed the correct type of memory.
v If you changed the memory, you updated the memory configuration with the
Configuration/Setup Utility program.
v All banks of memory on the DIMMs are enabled. The computer might have
automatically disabled a DIMM bank when it detected a problem or a DIMM
bank could have been manually disabled.
2. Check POST error log for error message 289:
v If the DIMM was disabled by a system-management interrupt (SMI), replace
the DIMM.
v If the DIMM was disabled by the user or by POST:
a. Start the Configuration/Setup Utility program.
b. Enable the DIMM.
c. Save the configuration and restart the computer.
If the problem remains, call for service.
Suggested action
Call for service.
Suggested action
See the information that comes with the monitor for adjusting and testing
instructions. (Some IBM monitors have their own self-tests.)
Verify that:
v The computer power cord is plugged into the computer and a working electrical
outlet.
v The monitor cables are connected properly.
v The monitor is turned on and the Brightness and Contrast controls are adjusted
correctly.
v If the computers are C2T chained together, verify that:
– The C2T chain cables are securely connected to the computers.
– The C2T breakout cable is connected properly.
– A computer that is turned on is selected.
Important: In some memory configurations, the 3-3-3 beep code might sound
during POST followed by a blank display screen. If this occurs and the Boot Fail
Count feature in the Start Options of the Configuration/Setup Utility program is set
to Enabled (its default setting), you must restart the computer three times to force
the system BIOS code to reset the CMOS values to the default configuration
(memory connector or bank of connectors enabled).
If the problem remains, call for service.
Chapter 5. Solving problems
81
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Table of Contents
Troubleshooting
