Universal Serial Bus (Usb) Port Problems; Video Problems; Light Path Diagnostics - IBM System x3550 M3 Type 4254 Problem Determination And 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 4, "Parts listing, System x3550 M3 Types 4254 and 7944," on page 159 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
A USB device does not work.

Video problems

See "Monitor and video problems" on page 93.

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 "Safety" on page vii and "Handling
static-sensitive devices" on page 169.
If an error occurs, view the light path diagnostics LEDs in the following order:
1. Look at the operator information panel on the front of the server.
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 Setup
utility (see "Using the Setup utility" on page 259 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.
v If the information LED is lit, it indicates that information about a suboptimal
condition in the server is available in the IMM system-event 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.
The following illustration shows the operator information panel:
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Chapter 3. Diagnostics