Universal Serial Bus (USB) port problems
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 4, “Parts listing, Type 7377 server,” on page 125 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
v Go to the IBM support Web site at http://www.ibm.com/systems/support/ to check for technical
information, hints, tips, and new device drivers or to submit a request for information.
Symptom Action
A USB device does not work.
1. Make sure that:
v The correct USB device driver is installed.
v The operating system supports USB devices.
2. Make sure that the USB configuration options are set correctly in the Setup
utility menu (see “Setup utility menu choices” on page 236 for more
information).
3. If you are using a USB hub, disconnect the USB device from the hub and
connect it directly to the server.
4. Move the device cable to a different USB connector.
5. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. USB device
b. (Only if the problem occurred with a front USB connector) Internal USB
cable, front USB connector assembly, or USB board
Video problems
See “Monitor or video problems” on page 47.
Error LEDs
The system board has error LEDs that will help to locate the source of the error
(see “System-board LEDs” on page 20). Run the diagnostic programs to find out
the cause of the error (see “IBM Dynamic System Analysis” on page 59).
The server is designed so that some LEDs remain lit when the server is connected
to an ac power source but is not turned on, provided that the power supply is
operating correctly. This feature helps you to isolate the problem when the operating
system is shut down.
Many errors are first indicated by a lit system-error LED on the control-panel
assembly of the server. If this LED is lit, one or more LEDs elsewhere in the server
might also be lit and can direct you to the source of the error.
Before working inside the server to view the LEDs, read the safety information that
begins on page vii and “Installation guidelines” on page 133.
If an error occurs, view the light path diagnostics LEDs in the following order:
1. Look at the front of the server. If the system-error LED is lit, it indicates that an
error has occurred.
2. Check the front and rear of the server to determine whether any component
LEDs are lit.
54 IBM System x3630 M3 Type 7377: Problem Determination and Service Guide
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