Universal
Serial
Bus
device
problems
Symptom
Suggested
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.
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.
PCI C
DASD
NMI
PCI A
PS1
SP
PCI B
PS2
CNFG
RAID
MEM
CPU
FAN
VRM
OVER SPEC
TEMP
BRD
REMIND
S ERR
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.
Press
the
reset
button
to
reset
the
server
and
run
the
power-on
self-test
(POST).
You
might
have
to
use
a
pen
or
the
end
of
a
straightened
paper
clip
to
press
the
button.
The
server
is
designed
so
that
LEDs
remain
lit
when
the
server
is
connected
to
an
ac
power
source
but
is
not
turned
on,
provided
that
the
power
supply
is
operating
correctly.
This
feature
helps
you
to
isolate
the
problem
when
the
operating
system
is
shut
down.
60
IBM
xSeries
346
Type
8840:
Installation
Guide
Summary of Contents for 8840 - eServer xSeries 346
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