Universal Serial Bus (USB) port problems
This topic provides possible solutions to problems with USB devices.
About this task
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, Types 7145, 7146, 7143, and 7191,” on page 81 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.
Symptom Action
A USB device does not work.
1. Run USB diagnostics (see “IBM Dynamic System Analysis” on page 71).
2. Make sure that:
v The correct USB device driver is installed.
v The operating system supports USB devices.
3. Make sure that the USB configuration options are set correctly in the Setup
utility (see “Configuring the server” on page 202 for more information).
4. If you are using a USB hub, disconnect the USB device from the hub and
connect it directly to the server.
Video problems
About this task
See “Monitor or video problems” on page 50.
Light path diagnostics
This topic provides information about light path diagnostics.
Light path diagnostics is a system of LEDs on various external and internal
components of the server. When an error occurs, LEDs are lit throughout the
server. By viewing the LEDs in a particular order, you can often identify the source
of the error.
The server is designed so that 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.
Any memory-card LED can be lit while the memory card is removed from the
server so that you can isolate a problem. After ac power has been removed from
the server, power remains available to these LEDs for up to 24 hours.
To view the memory card LEDs, press and hold the light path diagnostics button
on the memory card to light the error LEDs. The LEDs that were lit while the
server was turned on will be lit again while the button is pressed.
Many errors are first indicated by a lit information LED or system-error LED on
the operator information panel on the front of the server. If one or both of these
LEDs are lit, one or more LEDs elsewhere in the server might also be lit and can
direct you to the source of the error.
Chapter 3. Diagnostics 57
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