2. INDEX
INTRODUCTION OF COMPUTER
HISTORY OF COMPUTER
INTRODUCTION AND TROUBLESHOOTING OF
CPU
INTRODUCTION AND TROUBLSHOOTIN OF
MONITOR AND KEYBOARD
INTRODUCTION AND TROUBLESHOOTING OF
MOUSE AND PRINTER
INTRODUCTION AND TROUBLESHOOTING OF
UPS
3. computer
computer an electronic device which is
capable of receiving information (data) in
a particular form and of performing a
sequence of operations in accordance with
a predetermined but variable set of
procedural instructions (program) to
produce a result in the form of
information or signals.
4.
5. Charles Babbage
English inventor
1791-1871
taught math at Cambridge
University
invented a viable mechanical
computer equivalent to
modern digital computers
7. INTRODUCTION OF CPU
A central processing unit (CPU) is the
electronic circuitry within a computer that
carries out the instructions of a computer
program by performing the basic
arithmetic, logical, control and
input/output (I/O) operations specified by
the instructions.
10. No Power, Part 1
Active
outlet?
Using power
strip or UPS?
Turn computer off.
Plug power cord into computer
and power outlet.
Power cord
connected?
Turn computer off.
Plug power cord into
different active wall outlet.
Ensure power strip or
UPS is turned on.
Restart computer
and return to start of
this chart.
Turn off power,
disconnect power
cord, and open the
computer.
No Power
(Power LED is off)
Y
N
Y
N
Y
N
No Power, Part 2
11. 2-4
3. No Power, Part 2
No Power, Part 1
System board
have 5V
Aux LED?
Plug power connector
into system board.
N
Plug in power cord.
Power supply
connected to
system board?
5V Aux LED on?
Replace power supply.
1. Press power button on.
2. Check for fan rotation.
3. Press power button off.
Does fan spin?
N
N
1. Unplug power to all drives.
2. Remove all installed cards.
3. Press power button on.
Does fan spin?
Replace power supply.
Y Y
1. Add drives back one-at- a-
time to find faulty drive.
2. Add cards back one-at- a-
time to find faulty card.
Power on?
Done
Y
N
,
No Power, Part 3
Y
N
Y
N Y
12. NO Power, Part 3
No Power, Part 2
Drive power and
data cables
connected?
N
Loose
or damaged
components?
Y
N
Reinstall cover and
restart computer.
Reseat drive power and
data cable connectors.
Y
Reseat loose components
and replace damaged
items in the computer.
Power LED on?
Y
N Replace
power switch.
Power LED on?
Y
N
Replace
system board.
Done
Done
13. Error Messages part 1
Power LED has no color showing. Computer is off.
Power LED blinks green 1x/second. Normal suspend mode.
Power LED glows red. CPU not installed/fetching code.
Power LED blinks red 4x/second. CPU thermal shutdown.
Power LED blinks red 1x/two or more seconds. Power supply crow
bar.
Beeps,
CPU or Keyboard
Lights, or POST error
messages.
Power and hard drive LEDs glow red. Riser board not seated.
Num Lock LED flashing green. Memory error.
Caps Lock LED flashing green. No video.
Scroll Lock LED flashing green. System board failure, prior to video.
Power LED glows green. Computer is on.
Audible. 1L 3S. System ROM is bad; system is running in FailSafe
Boot Block Mode.
Audible. 2S. Power-ON successful.
Continued on Page 2-10, Error Messages, Part 2.
Notes: Short (S) and long (L) beeps will
only be heard if the system has a
speaker.
LEDs will only function on PS/2 keyboards,
not USB.
14. Num Lock blinking. System memory not present or incompatible.
Unplug, open computer, and check memory modules. Ensure
memory modules are correct type and that they match in size and
speed.
Cap Lock blinking. Video controller not present or incorrectly
initialized. Ensure monitor is plugged in. Unplug, open computer, and
check video card. Reseat card and ensure it is in the proper expansion
slot.
All keyboard LEDs blinking. ROM Failure. Create ROM Paq diskette
and reload ROM.
Scroll Lock blinking. System HW failure prior to video. Unplug, open
computer, and check for physical damage. Ensure all cables and cards are
seated. Look for burn marks or smoke.
No beeps. HD and Power LED blinking. Riser not detected. Unplug,
open computer, and check and reseat riser board.
2S Beeps. System Option not set. Select F1. If error occurs after reboot,
unplug and open computer and check CMOS jumper setting.
Part 2
15. The “Blue Screen” has appeared.
The dreaded “Blue Screen of Death”. There’s not a lot to
be done except to reboot the machine. If it keeps
occurring, this is an indication of a major problem with
the computer.
18. The picture does not appear.
Check to make sure the signal cable is
firmly connected in the socket.
Check to see if the computer systems power is
ON. Check that the Brightness Control is at the
appropriate position, not at the minimum.
19. No Video, Part
No video
Beeps or
flashing CPU
or keyboard
lights?
Monitor LED
on?
Contrast and
brightness
turned up?
Turn contrast
and
brightness up.
,
No Video, Part 2
Error Messages,
Part 1
LED color?
(note 1)
Video
adapter
connected?
(note 2)
Monitor plugged
in and turned
on?
Plug in and
turn on
monitor
Reconnect
monitor (note 3).
Y
N
Y
Y
N
NGreen
Amber
N
N
Video OK?
Y Done
Y
Y
Plug in, turn on, and
return to Page 2-2,
Initial Troubleshooting.
Replace
monitor.
N
20. Adjust the H-Size, H-Phase or V-Size, V-Center
controls.
Check if the signal timing of the computer system is
within the specification of the monitor
The Screen is not synchronized.
Check to make sure the signal cable is firmly
connected in the socket. Check that the output level
matches the input level of your computer. Make
sure the signal timing of the computer system is
within the specification of the monitor.
21. The screen is shaking
Move all objects that emit a magnetic field, such as a motor
or transformer, away from the monitor.
Check if the specified voltage is applied.
Check if the signal timing of the computer system is
within the specification of the monitor.
The screen is too bright or too dark
1. Check if the Brightness or contrast control is at the appropriate
position, not at the maximum or minimum.
2. Check if the specified voltage is applied
3. Check if the signal timing of the computer system is within the
specification of the monitor.
4. Especially, check the horizontal frequency
24. Keyboard Symptoms
Typical symptoms associated with keyboard failures include the
following:
No characters appear on screen when entered from the keyboard.
Some keys work, whereas others do not work.
A Keyboard Error—Keyboard Test Failure error appears.
A KB/Interface Error—Keyboard Test Failure error appears.
An error code of six short beeps is produced during boot up
(BIOS dependent).
The wrong characters are displayed.
An IBM-compatible 301 error code appears.
An Unplugged Keyboard error appears.
A key is stuck.
28. Printer is not working
First, make sure that the printer is on. When a printer is on,
it should have some light or LED (usually green) indicating
it's receiving power.
Your printer should have two cables connected to it: the
power cable and the data cable. Make sure the power and
data cables are connected to both the printer and
computer.
If you do not have any indicator light, make sure the printer
is connected to a working power outlet by verifying each
end of the power cable. Next, press the printer power
button.
If after doing the above steps, the printer still does not
display a power status indicator light, you have a serious
printer issue and we suggest contacting the printer
manufacture for repair or replacement.
33. ISSUE: Mouse Cursor Does not Relocate Smoothly
SOLUTION: If your mouse cursor does stagnate smoothly
then the most likely cause will be either dust in the mouse
sensor or dust on the mouse surface, be it a mouse mat or
work desk. Make sure that you provide the mouse a
comprehensive cleansing making certain just to use a clean
cloth and no chemicals which are most likely to trigger
even more problems.
ISSUE: Mouse Not Working At All
SOLUTION: Your mouse not working at all could possibly
be from a range of issues. The mouse not working may be
as an outcome from a loose hookup, defective electrical
wiring, a defective USB or PS/2 port or a defective IR
cordless receiver. Some wireless gadgets (and some wired)
will need a mouse motorist to be installed for correct use.
If all this falls short then, as usual, disconnect and power
up your mouse and COMPUTER.
.
34. ISSUE: Mouse Guideline Too Slow Or Too Quickly
SOLUTION: There’s only actually one option for this and
it’s a software configuration problem. This can quickly be
repaired by visiting Control board) Mouse) Tip Options
Tab. Modification the pointer speed to the desired level by
moving the slider up or down till it feels more comfortable.
ISSUE: Issue With Double Click
SOLUTION: As above this will most likely be a software
setup problem and can be taken care of by going to Control
Panel) Mouse) Buttons tab. Modification the double click
speed and examination it to a comfortable click rate level.
36. Freezing and crashing
THREE FINGER SALUTE - CTRL-ALT-DEL TO CLOSE
UNRESPONSIVE PROGRAMS.
IF CTRL-ALT-DEL DOES NOT WORK, HOLD IN POWER BUTTON
ON CPU UNTIL IT SHUTS DOWN, THEN RESTART .
HAVE YOU INSTALLED ANY NEW SOFTWARE? TRY REMOVING
IT TO SEE IF IT IS THE CAUSE.
TRY REMOVING IT TO SEE IF IT IS THE CAUSE IF YOU CANNOT
GET IN TO UNINSTALL,
BOOT IN SAFE MODE - PRESS F8 WHILE REBOOTING - THEN
TRY TO UNINSTALL SHUT DOWN AND UNPLUG COMPUTER
FOR 5 MINUTES, THEN TRY AGAIN
38. KEEP IT RUNING
REBOOT PERIODICALLY.
KEEP AWAY FROM CHALK DUST & MAGNETS .
EMPTY RECYCLE BIN .
DEFRAGMENTERFR EVERY OTHER MONTH - START -
PROGRAMS - ACCESSORIES - SYSTEM TOOLS - DISK
DEFRAGMENTER .
CLEAN OUT THE TEMPORARY INTERNET FILES
FOLDER. FROM YOUR BROWSER GO TOOLS-
INTERNET OPTIONS AND USE THE DELETE FILES
OPTION. IT’S ALSO A GOOD IDEA TO DELETE
COOKIES AND LOCALLY CACHED FILES IN YOUR
BROWSER PERIODICALLY.
