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13.
Turn
off
the
server.
14.
Move
the
jumper
on
J28
to
pins
1
and
2
to
return
to
normal
startup
mode.
15.
Replace
fans
3
and
4
(see
16.
Restart
the
server.
17.
Replace
the
cover
(see
Ethernet
controller
troubleshooting
The
method
of
testing
the
Ethernet
controller
depends
on
which
operating
system
is
being
used
(see
the
Ethernet
controller
device
driver
README
file).
You
can
use
the
Ethernet
wrap
test
to
determine
if
a
hardware
problem
is
causing
the
Ethernet
connection
to
fail.
To
perform
the
Ethernet
wrap
test,
use
the
wrap
plug
(FRU
48P9494)
with
the
diagnostic
tests.
Note:
The
wrap
plug
connects
to
the
system
serial
port.
Do
not
connect
the
wrap
plug
to
the
serial
port
of
the
Remote
Supervisor
Adapter.
If
the
problem
still
exists
after
checking
the
operating
system
documentation,
try
the
following:
v
Make
sure
that
the
cable
is
installed
correctly.
The
network
cable
must
be
securely
attached
at
all
connections.
If
the
cable
is
attached
but
the
problem
remains,
try
a
different
cable.
If
you
set
the
Ethernet
controller
to
operate
at
100
Mbps,
you
must
use
Category
5
cabling.
If
you
directly
connect
two
workstations
(without
a
hub),
or
if
you
are
not
using
a
hub
with
X
ports,
use
a
crossover
cable.
Note:
To
determine
whether
a
hub
has
an
X
port,
check
the
port
label.
If
the
label
contains
an
X
,
the
hub
has
an
X
port.
v
Determine
if
the
hub
supports
auto-negotiation.
If
not,
try
configuring
the
integrated
Ethernet
controller
manually
to
match
the
speed
and
duplex
mode
of
the
hub.
v
Check
the
Ethernet
controller
lights
on
the
server
rear
panel.
These
lights
indicate
whether
a
problem
exists
with
the
connector,
cable,
or
hub.
–
The
Ethernet
Link
Status
light
illuminates
when
the
Ethernet
controller
receives
a
LINK
pulse
from
the
hub.
If
the
light
is
off,
there
might
be
a
defective
connector
or
cable,
or
a
problem
with
the
hub.
–
The
Ethernet
Transmit/Receive
Activity
light
illuminates
when
the
Ethernet
controller
sends
or
receives
data
over
the
Ethernet
Network.
If
the
Ethernet
Transmit/Receive
Activity
light
is
off,
make
sure
that
the
hub
and
network
are
operating
and
that
the
correct
device
drivers
are
loaded.
v
Check
the
LAN
activity
light
(if
available)
on
the
rear
of
the
server.
The
LAN
activity
light
is
illuminated
when
data
is
active
on
the
Ethernet
network.
If
the
LAN
activity
light
is
off,
make
sure
that
the
hub
and
network
are
operating
and
that
the
correct
device
drivers
are
loaded.
v
Make
sure
that
you
are
using
the
correct
device
drivers,
which
are
supplied
with
the
server.
v
Check
for
operating-system-specific
causes
for
the
problem.
v
Make
sure
that
the
device
drivers
on
the
client
and
server
are
using
the
same
protocol.
If
the
Ethernet
controller
still
cannot
connect
to
the
network,
inform
the
network
administrator.
Diagnostics
67
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