IBM System x3850 User 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 Action
A USB device does not work. 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.
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.
DASD
NMI
PCI
BRD
I/O
BRD
PS
NONRED
SP
LINK
RAID
MEM
CPU
CPU
BRD
FAN
PCI
VRM
OVER SPEC
TEMP
REMIND
LOG
Light Path
Diagnostics
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.
60 IBM System x3850 Type 8864: Installation Guide

IBM System x3850 Specifications

General

Brand	IBM
Model	System x3850
Category	Server
Language	English