IBM IntelliStation M Pro Hardware Maintenance Manual page 116

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.
(The startup (boot)
microprocessor is not working
correctly.)
Monitor problems
Symptom
Testing the monitor.
The screen is blank.
Only the cursor appears.
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IBM IntelliStation M Pro Types 6220 and 6230: Hardware Maintenance Manual
FRU/action
1. Make sure that:
v The memory modules are seated correctly.
v You have installed the correct type of memory.
v If you changed the memory, you updated the memory configuration in the
Configuration/Setup Utility program.
v All banks of memory are enabled. The computer might have automatically
disabled a memory bank when it detected a problem, or a memory bank
might 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, run the
Configuration/Setup Utility program and enable the DIMM.
3. DIMM.
4. System board.
FRU/action
1. Verify that the microprocessor is seated properly.
2. Microprocessor.
FRU/action
See the information that comes with the monitor for adjusting and testing
instructions. (Some IBM monitors have their own self-tests.)
1. 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.
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 correctly.
– The selected computer is turned on.
Important: In some memory configurations, the 3-3-3 beep code might sound
during POST followed by a blank monitor screen. If this occurs and the Boot
Fail Count feature in the Start Options of the Configuration/Setup Utility
program is enabled (its default setting), you must restart the computer three
times to force the BIOS to reset the configuration settings to the default
configuration (memory connector or bank of connectors enabled).
2. If the problem remains, replace:
a. Monitor
b. Video adapter, if installed
c. System board
See "Undetermined problems" on page 115.