Lenovo ThinkCentre M57 English (User guide) - Page 24

Symptom, Action

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Symptom The keyboard does not work. The computer does not respond to the keyboard. Action Verify that: v The computer is turned on. v The monitor is turned on and the brightness and contrast controls are set correctly. v The keyboard is securely connected to the keyboard connector on the computer. v No keys are stuck. The USB Keyboard does not work. If you cannot correct the problem, have the computer serviced. Refer to the safety and warranty information that is provided with your computer for a list of service and support telephone numbers. Verify that: v The computer is turned on. v The keyboard is securely connected to a USB connector on the front or rear of the computer. v No keys are stuck. The mouse does not work. The computer does not respond to the mouse. If you cannot correct the problem, have the computer serviced. Refer to the safety and warranty information that is provided with your computer for a list of service and support telephone numbers. Verify that: v The computer is turned on. v The mouse is securely connected to the mouse connector on the computer. v The mouse is clean. Refer to "Cleaning the mouse" on page 19 for further information. The operating system will not start. If you cannot correct the problem, have the computer serviced. Refer to the safety and warranty information that is provided with your computer for a list of service and support telephone numbers. Verify that: v There is no diskette in the diskette drive. v The startup sequence includes the device where the operating system resides. Usually, the operating system is on the hard disk drive. For more information, see "Selecting a startup device" on page 11. Note: For SMC (Secure Managed Client) computers, you might receive the error message ″No operating system found. Press F1 to repeat boot sequence.″ In this case, press Ctrl+Alt+Delete instead of F1 to establish a connection to the storage area network where your operating system is stored. Verify that the user name is not logged on in another location. If you cannot correct the problem, have the computer serviced. Refer to the safety and warranty information that is provided with your computer for a list of service and support telephone numbers. The SMC login prompt disappears before you log on and then a black screen displays (for SMC computers only). Contact your administrator. The computer beeps multiple times before the operating system starts. Verify that no keys are stuck down. If you cannot correct the problem, have the computer serviced. Refer to the safety and warranty information that is provided with your computer for a list of service and support telephone numbers. 16 User Guide

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Symptom
Action
The
keyboard
does
not
work.
The
computer
does
not
respond
to
the
keyboard.
Verify
that:
v
The
computer
is
turned
on.
v
The
monitor
is
turned
on
and
the
brightness
and
contrast
controls
are
set
correctly.
v
The
keyboard
is
securely
connected
to
the
keyboard
connector
on
the
computer.
v
No
keys
are
stuck.
If
you
cannot
correct
the
problem,
have
the
computer
serviced.
Refer
to
the
safety
and
warranty
information
that
is
provided
with
your
computer
for
a
list
of
service
and
support
telephone
numbers.
The
USB
Keyboard
does
not
work.
Verify
that:
v
The
computer
is
turned
on.
v
The
keyboard
is
securely
connected
to
a
USB
connector
on
the
front
or
rear
of
the
computer.
v
No
keys
are
stuck.
If
you
cannot
correct
the
problem,
have
the
computer
serviced.
Refer
to
the
safety
and
warranty
information
that
is
provided
with
your
computer
for
a
list
of
service
and
support
telephone
numbers.
The
mouse
does
not
work.
The
computer
does
not
respond
to
the
mouse.
Verify
that:
v
The
computer
is
turned
on.
v
The
mouse
is
securely
connected
to
the
mouse
connector
on
the
computer.
v
The
mouse
is
clean.
Refer
to
“Cleaning
the
mouse”
on
page
19
for
further
information.
If
you
cannot
correct
the
problem,
have
the
computer
serviced.
Refer
to
the
safety
and
warranty
information
that
is
provided
with
your
computer
for
a
list
of
service
and
support
telephone
numbers.
The
operating
system
will
not
start.
Verify
that:
v
There
is
no
diskette
in
the
diskette
drive.
v
The
startup
sequence
includes
the
device
where
the
operating
system
resides.
Usually,
the
operating
system
is
on
the
hard
disk
drive.
For
more
information,
see
“Selecting
a
startup
device”
on
page
11.
Note:
For
SMC
(Secure
Managed
Client)
computers,
you
might
receive
the
error
message
″
No
operating
system
found.
Press
F1
to
repeat
boot
sequence.
″
In
this
case,
press
Ctrl+Alt+Delete
instead
of
F1
to
establish
a
connection
to
the
storage
area
network
where
your
operating
system
is
stored.
Verify
that
the
user
name
is
not
logged
on
in
another
location.
If
you
cannot
correct
the
problem,
have
the
computer
serviced.
Refer
to
the
safety
and
warranty
information
that
is
provided
with
your
computer
for
a
list
of
service
and
support
telephone
numbers.
The
SMC
login
prompt
disappears
before
you
log
on
and
then
a
black
screen
displays
(for
SMC
computers
only).
Contact
your
administrator.
The
computer
beeps
multiple
times
before
the
operating
system
starts.
Verify
that
no
keys
are
stuck
down.
If
you
cannot
correct
the
problem,
have
the
computer
serviced.
Refer
to
the
safety
and
warranty
information
that
is
provided
with
your
computer
for
a
list
of
service
and
support
telephone
numbers.
16
User
Guide