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
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
Summary of Contents for System x3850
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