Universal Serial Bus (Usb) Device Problems; Video Problems; Light Path Diagnostics - IBM x3350 - System - 4192 Installation Manual

Universal Serial Bus (USB) device 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 the parts listing in the Problem Determination and Service Guide on the IBM System x Documentation
CD 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 42.

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 a
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.
To acknowledge a system error but not take immediate action, press the remind
button to place the server in Remind mode. When the server is in Remind mode,
the system-error LED on the front of the server flashes. If a new failure occurs, the
system-error LED is lit again.
Press the reset button to reset the server and run the power-on self-test (POST).
You might have to use a pen or the end of a straightened paper clip to press the
button.
The following illustration shows the LEDs on the light path diagnostics panel.
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IBM System x3350 Types 4192 and 4193: Installation Guide
Action
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
Configuration/Setup Utility program (see the User's Guide for more information).
3. If you are using an external USB hub, disconnect the USB device from the hub
and connect it directly to the server.