Power-supply leds, Server power features, Turning on the server – Lenovo 3797 User Manual
Page 47: Turning off the server, Power-supply, Leds, Server, Power, Features, Turning
Power-supply
LEDs
The
following
illustration
shows
the
power-supply
LEDs
on
the
rear
of
the
server.
For
more
information
about
solving
power-supply
problems,
see
the
Hardware
Maintenance
Manual.
1
AC
power
LED
(green)
2
DC
power
LED
(green)
3
Power-supply
error
LED
(amber)
Server
power
features
When
the
server
is
connected
to
a
power
source
but
is
not
turned
on,
the
operating
system
does
not
run,
and
all
core
logic
except
for
the
Integrated
Management
Module
(IMM)
is
shut
down;
however,
the
server
can
respond
to
requests
from
the
IMM,
such
as
a
remote
request
to
turn
on
the
server.
The
power-on
LED
flashes
to
indicate
that
the
server
is
connected
to
power
but
is
not
turned
on.
Turning
on
the
server
Approximately
3
minutes
after
the
server
is
connected
to
power,
the
power-control
button
becomes
active,
and
one
or
more
fans
might
start
running
to
provide
cooling
while
the
server
is
connected
to
power.
You
can
turn
on
the
server
and
start
the
operating
system
by
pressing
the
power-control
button.
If
a
power
failure
occurs
while
the
server
is
turned
on,
the
server
will
restart
automatically
when
power
is
restored.
For
32-bit
operating
systems
only:
Some
memory
is
reserved
for
various
system
resources
and
is
unavailable
to
the
operating
system.
The
amount
of
memory
that
is
reserved
for
system
resources
depends
on
the
operating
system,
the
configuration
of
the
server,
and
the
configured
PCI
options.
Turning
off
the
server
When
you
turn
off
the
server
and
leave
it
connected
to
power,
the
server
can
respond
to
requests
from
the
IMM,
such
as
a
remote
request
to
turn
on
the
server.
While
the
server
remains
connected
to
power,
one
or
more
fans
might
continue
to
run.
To
remove
all
power
from
the
server,
you
must
disconnect
it
from
the
power
source.
Important:
To
view
the
error
LEDs
on
the
system
board,
leave
the
server
connected
to
a
power
source.
Chapter
4.
Server
controls,
LEDs,
and
power
31