IBM xSeries 150 User Reference Manual page 113

Table 16. Troubleshooting charts
Device
Intermittent problems
A problem occurs only
occasionally and is difficult to
detect.
Keyboard, mouse, or pointing-
device problems.
All or some keys on the
keyboard do not work.
The mouse or pointing device
does not work.
Memory problems
The amount of memory
displayed is less than the
amount of memory installed.
Microprocessor problems
The server emits a continuous
tone during POST.
Monitor problems
Testing the monitor.
Verify that:
1. All cables and cords are connected securely to the rear of the server and attached
options.
2. When the server is turned on, air is flowing from the rear of the server at the fan
grill. If there is no air flow, the fan is not working. This causes the server to
overheat and shut down.
3. Ensure that the SCSI bus and devices are configured correctly and that the last
external device in each SCSI chain is terminated correctly.
If the items above are correct, call for service.
1. Make sure that the keyboard cable is properly connected to the server.
2. Make sure that the server and the monitor are turned on.
3. Try using another keyboard.
If the items above are correct, call for service.
1. Verify that the mouse or pointing-device cable is securely connected and the
device drivers are installed correctly.
2. Try using another mouse or pointing device.
If the problem remains, call for service.
Verify that:
1. The memory modules are seated properly.
2. You have installed the correct type of memory.
3. If you changed the memory, you updated the memory configuration with the
Configuration/Setup Utility program.
4. All banks of memory on the DIMMs are enabled. The server might have
automatically disabled a DIMM bank when it detected a problem or a DIMM
bank could have been manually disabled.
If the above items are correct, run the memory diagnostic program. The system might
have detected a bad memory module and automatically reallocated memory to
enable you to continue to operate. If the memory tests fail, call for service or replace
the failing DIMM.
The startup (boot) microprocessor is not working properly.
Verify that the startup microprocessor is seated properly. If it is, replace the startup
microprocessor.
If the problem remains, call for service.
Some IBM monitors have their own self-tests. If you suspect a problem with your
monitor, refer to the information that comes with the monitor for adjusting and
testing instructions.
If you still cannot find the problem, call for service.
Suggested action
Chapter 4. Solving Problems
101