Universal Serial Bus (Usb) Port Problems; Video Problems; Light Path Diagnostics - IBM System x3500 Service Manual

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 3, "Parts listing, System x3500 Type 7977," on page 41 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
A USB device does not work.

Video problems

See "Monitor problems" on page 123.

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.
When LEDs are lit to indicate an error, they remain lit when the server is turned off,
provided that the server is still connected to power and the power supply is
operating correctly.
Before you work inside the server to view light path diagnostics LEDs, read the
safety information that begins on page vii and "Handling static-sensitive devices" on
page 57.
If an error occurs, view the light path diagnostics LEDs in the following order:
1. Look at the informational LEDs on the front of the server.
Action
1. Run USB diagnostics (see "Running the diagnostic programs" on page 138).
2. Make sure that:
v The correct USB device driver is installed.
v The operating system supports USB devices.
v A standard PS/2 keyboard or mouse is not connected to the server. If it is, a
USB keyboard or mouse will not work during POST.
3. Make sure that the USB configuration optional devices are set correctly in the
Configuration/Setup Utility program menu (see the User's Guide 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.
v If the information LED is lit, it indicates that information about a suboptimal
condition in the server is available in the BMC log or in the system-error log.
v If the system-error LED is lit, it indicates that an error has occurred; go to
step 2 on page 132.
The following illustration shows the information LEDs that show through the
bezel.
131
Chapter 5. Diagnostics