IBM 387, 393, 391, 389, 388, 441 Memory module problems, Keyboard, mouse, or USB device problems

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.

Notes:

1.If you are instructed to remove, install, or replace any CRUs, refer to the related procedure in Chapter 6 “Installing, removing, or replacing hardware” on page 83.

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	1. Make sure that:
than the total capacity of the installed physical memory		• All memory modules are the correct type
modules and you suspect a memory module problem.
		supported by the server. See “Features” on page
		7.
		• You follow the memory module installation rules.
		See “Memory module installation rules” on page
		90.
		• 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.

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.
	• No keys are stuck.
	• The USB controller is enabled in the Setup Utility
	program. See “Using the Setup Utility program”
	on page 55.
	2. Restart the server.

172ThinkServer User Guide