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 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 (see “Using the Setup utility” on page 301 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.
Video problems
See “Monitor or video problems” on page 110.
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 193.
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.
v If the check log LED is lit, it indicates that an error or multiple errors have
occurred. The sources of the errors cannot be isolated or concluded by
observing the light path diagnostics LEDs directly. A further investigation into
IMM2 system-event log or system-error log might be required.
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:
124 IBM System x3650 M4 Type 7915: Problem Determination and Service Guide
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