Lenovo ThinkCentre A52 (English) Quick reference guide - Page 41

Troubleshooting, diagnostics

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Chapter 5. Troubleshooting and diagnostics This chapter describes some basic troubleshooting and diagnostic tools. If your computer problem is not described here, use Access Help for more detailed troubleshooting information or see "Additional help" on page xv. Basic troubleshooting Symptom Action The computer does not Verify that: start when you press the v The power cord is plugged into the rear of the computer power button. and into a working electrical outlet. v If your computer has a secondary power switch on the back of the computer, ensure that it is switched on. Check the power indicator on the front of the computer to ensure that the power is on. v The power supply and system board are working. See "Power Supply and System board Diagnostic LEDs" on page 25. The monitor screen is blank. If you cannot correct the problem, have the computer serviced. Verify that: v The monitor cable is securely attached to the rear of the monitor and to the rear of the computer. v The monitor power cord is plugged into the monitor and into a working electrical outlet. v The monitor is turned on, and the brightness and contrast controls are set correctly. v The monitor signal cable is securely connected to the monitor and to the monitor connector on the computer. v The power supply and system board are working. See "Power Supply and System board Diagnostic LEDs" on page 25. Note: If your computer has two monitor connectors, verify that your monitor is connected to the one in the PCI-express (PCI-e) option connector rather than the one in the rear of the system board. See Step 4 on page 3. If you cannot correct the problem, have the computer serviced. © Lenovo 2005, 2006. Portions © IBM Corp. 2005. 23

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Chapter
5.
Troubleshooting
and
diagnostics
This
chapter
describes
some
basic
troubleshooting
and
diagnostic
tools.
If
your
computer
problem
is
not
described
here,
use
Access
Help
for
more
detailed
troubleshooting
information
or
see
“Additional
help”
on
page
xv.
Basic
troubleshooting
Symptom
Action
The
computer
does
not
start
when
you
press
the
power
button.
Verify
that:
v
The
power
cord
is
plugged
into
the
rear
of
the
computer
and
into
a
working
electrical
outlet.
v
If
your
computer
has
a
secondary
power
switch
on
the
back
of
the
computer,
ensure
that
it
is
switched
on.
Check
the
power
indicator
on
the
front
of
the
computer
to
ensure
that
the
power
is
on.
v
The
power
supply
and
system
board
are
working.
See
“Power
Supply
and
System
board
Diagnostic
LEDs”
on
page
25.
If
you
cannot
correct
the
problem,
have
the
computer
serviced.
The
monitor
screen
is
blank.
Verify
that:
v
The
monitor
cable
is
securely
attached
to
the
rear
of
the
monitor
and
to
the
rear
of
the
computer.
v
The
monitor
power
cord
is
plugged
into
the
monitor
and
into
a
working
electrical
outlet.
v
The
monitor
is
turned
on,
and
the
brightness
and
contrast
controls
are
set
correctly.
v
The
monitor
signal
cable
is
securely
connected
to
the
monitor
and
to
the
monitor
connector
on
the
computer.
v
The
power
supply
and
system
board
are
working.
See
“Power
Supply
and
System
board
Diagnostic
LEDs”
on
page
25.
Note:
If
your
computer
has
two
monitor
connectors,
verify
that
your
monitor
is
connected
to
the
one
in
the
PCI-express
(PCI-e)
option
connector
rather
than
the
one
in
the
rear
of
the
system
board.
See
Step
4
on
page
3.
If
you
cannot
correct
the
problem,
have
the
computer
serviced.
©
Lenovo
2005,
2006.
Portions
©
IBM
Corp.
2005.
23