Universal Serial Bus Device Problems; Video Problems; Light Path Diagnostics - IBM System x3850 Installation Manual

Universal Serial Bus 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 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 56.

Light path diagnostics

Use light path diagnostics to diagnose system errors. The light path diagnostics
panel is inside the light path diagnostics drawer, on the right front of the server. To
access the light path diagnostics panel, slide the latch to the left on the front of the
light path diagnostics drawer.
The following illustration shows the controls and LEDs on the light path diagnostics
panel.
To acknowledge a system error but not take immediate action, press the remind
button and place light path diagnostics 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.
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IBM System x3850 Type 8864: Installation Guide
Action
Make sure that:
v You are not trying to use a USB device during POST if a standard (non-USB)
keyboard is connected to the keyboard connector. If a standard (non-USB)
keyboard is connected to the keyboard connector, the USB is disabled, and no
USB device will work during POST.
v The correct USB device driver is installed.
v Your operating system supports USB devices.
If the problem remains, call for service.
Diagnostics
OVER SPEC
CPU
REMIND
MEM
SP
NONRED
PCI
BRD
Light Path
PS LINK
VRM LOG
NMI
PCI
DASD RAID
TEMP FAN
CPU I/O
BRD BRD