IBM 388 User Manual
Memory module problems
Follow the suggested actions for the corresponding symptom in the order in which they are listed until the
problem is solved. If none of these actions solve the problem, see “Troubleshooting procedure” on page
167 for the subsequent steps you should check after using the information in this topic. If the problem
cannot be solved by yourself, seek technical assistance. See Chapter 8 “Getting information, help, and
service” on page 175.
problem is solved. If none of these actions solve the problem, see “Troubleshooting procedure” on page
167 for the subsequent steps you should check after using the information in this topic. If the problem
cannot be solved by yourself, seek technical assistance. See Chapter 8 “Getting information, help, and
service” on page 175.
Notes:
1. If you are instructed to remove, install, or replace any CRUs, refer to the related procedure in Chapter 6
2. If an action step is preceded by “(Trained service technician only),” this action step is reserved for a
trained service technician and must be performed only by a trained service technician.
Symptom
Action
The amount of system memory that is displayed is less
than the total capacity of the installed physical memory
modules and you suspect a memory module problem.
than the total capacity of the installed physical memory
modules and you suspect a memory module problem.
1. Make sure that:
• All memory modules are the correct type
supported by the server. See “Features” on page
7.
7.
• You follow the memory module installation rules.
• All memory modules are seated correctly and
securely.
• The system firmware is up-to-date.
2. Run any diagnostic programs to test the memory
modules.
3. Reinstall the memory modules.
4. Replace the suspect memory modules.
5. (Trained service technician only) Replace the system
board.
Keyboard, mouse, or USB device problems
Follow the suggested actions for the corresponding symptom in the order in which they are listed until the
problem is solved. If none of these actions solve the problem, see “Troubleshooting procedure” on page 167
for the subsequent steps you should check after using the information in this topic.
problem is solved. If none of these actions solve the problem, see “Troubleshooting procedure” on page 167
for the subsequent steps you should check after using the information in this topic.
Symptom
Action
All or some keys on the keyboard do not work.
1. Make sure that:
• The USB keyboard cable is securely connected
to a USB connector on the server. If the USB
keyboard is connected to a USB hub, disconnect
the keyboard from the hub and connect it directly
to the server.
keyboard is connected to a USB hub, disconnect
the keyboard from the hub and connect it directly
to the server.
• No keys are stuck.
• The USB controller is enabled in the Setup Utility
program. See “Using the Setup Utility program”
on page 55.
on page 55.
2. Restart the server.
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ThinkServer User Guide