IBM TotalStorage NAS 300 User Reference page 151

Table 24. Error symptoms and suggested actions (continued)
A problem occurs only
occasionally and is difficult to
detect.
Keyboard, mouse, or point-device problems
Symptom
All or some keys on the
keyboard do not work.
The mouse or pointing device
does not work.
Memory problems
Symptom
The amount of system memory
displayed is less than the
amount of physical memory
installed.
Microprocessor problems
Symptom
The engine emits a continuous
tone during POST. (The startup
(boot) microprocessor is not
working properly.)
Monitor problems
Symptom
1. Verify that:
v All cables and cords are connected securely to the rear of the engine and
attached options.
v When the engine is turned on, air is flowing from the rear of the engine at the
fan grill. If there is no airflow, the fan is not working. This causes the engine
to overheat and shut down.
v Ensure that the SCSI bus and devices are configured correctly and that the
last external device in each SCSI chain is terminated correctly.
2. Check the system error log from Setup or through the diagnostics in the optional
Remote Supervisor Adapter.
Part/action
1. Verify that:
v The keyboard cable is securely connected to the system, and the keyboard
and mouse cables are not reversed.
v The engine and the monitor are turned on.
2. Keyboard.
3. System board.
1. Verify that the mouse or pointing-device cable is securely connected, and that
the keyboard and mouse cables are not reversed.
2. Mouse or pointing device.
3. System board.
Part/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 engine 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 engine.
3. DIMM.
4. System board.
Part/action
1. Verify that the startup microprocessor is seated properly.
2. Startup microprocessor.
Part/action
Appendix D. Symptom-to-part index
137