This document discusses types of computer system errors. It describes 10 common computer errors that can occur such as no video output, failure to boot, and endless loading of the operating system. It also discusses categories of operating system errors like system errors caused by hardware issues, runtime errors from corrupted files, and device manager errors from driver or hardware problems. Finally, it provides a short quiz to test the reader's understanding.

1. z
ICT 9:
Computer Hardware
Servicing
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS
OF COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR

2. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
There are several errors in a computer
from the point you open it up to the point
you reach the stand by window (reaching
standby windows means boot process
has no error).
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3. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
Here is a list of computer errors:
1. No Video Output - When you open your
PC, nothing shows up in your monitor
and the LED indicator of your monitor is
flashing in yellow color.
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4. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
Here is a list of computer errors:
2. No Video Output - Same as number
one but now the LED indicator of your
monitor is in steady orange color.
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5. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
Here is a list of computer errors:
3. Doesn't Boot - When you open your PC
it will show the processor brand and/or
the motherboard brand but doesn't
continue. Usually this error will result to
system restart over and over again.
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6. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
Here is a list of computer errors:
4. Never Ending Loading of Operating
system - The computer opens up then
boots but when the operating system
loads it doesn't continue and it will take
a lifetime if you're going to wait for it to
load.
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7. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
Here is a list of computer errors:
5. Lots of pop up windows showing on
standby mode - This also happens even if
you try disconnecting your computer set
from the internet. This is what we called
aftershock virus which will continue to run
even if internet is disconnected
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8. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
Here is a list of computer errors:
6. Lots of hardware installation windows
appear - This happens even if you try
installing the hardware. When you
restart your set it will happen again.
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9. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
Here is a list of computer errors:
7. Safe mode doesn't work - When you try
going to safe mode all you will see is a
list of files in Command prompt style.
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10. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
Here is a list of computer errors:
8. Keyboard and mouse system restart -
This will happen only in standby mode,
when you move your mouse or type
something, your system will
automatically restart and the worst part
is it will delete a file at random.
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11. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
Here is a list of computer errors:
9. Sound on/off error - Upon loading the
operating system, you will hear a
loading sound and then the sound
stops, when you try running an audio
file, no sound will be heard.
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12. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
Here is a list of computer errors:
10. Application causes system to restart -
Just like the mouse problem, when you
open a program that will take the whole
screen like for example a game and/or a
program applications, when you close it,
it will cause your system to restart.
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13. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
Aside from the common computer errors,
computers also can have different
Operating System (OS) errors.
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14. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
OS errors can be classified into various
categories, such as:
1. System errors - These are moderately
dangerous types of errors among those that can
pop up on your PC. System errors are caused by
malfunctioning hardware components, corrupted
operating system modules, etc.
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15. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
OS errors can be classified into various
categories, such as:
2. Runtime errors - Runtime errors are caused by
corrupted or malfunctioning system files or
software executables. Most runtime errors cause
the application that caused it to shut down.
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16. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
OS errors can be classified into various
categories, such as:
2. Runtime errors - However, more serious runtime
errors may cause the system to become unstable
or unresponsive, leaving you with no choice but
to reach for the Reset button.
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17. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
OS errors can be classified into various
categories, such as:
3. Stop errors - Stop errors are caused by
corrupted hardware, especially malfunctioning
RAM modules and bad sectors on hard disks.
Stop errors can be difficult to resolve at times.
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18. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
OS errors can be classified into various
categories, such as:
4. Device Manager Errors - These are usually
caused by corrupted driver files or malfunctioning
hardware components. In case of the former
cause, the problem is usually solved simply by
reinstalling or updating the drivers.
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19. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
OS errors can be classified into various
categories, such as:
4. Device Manager Errors - However, the latter
cause can often be solved only by replacing
hardware components.
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20. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
OS errors can be classified into various
categories, such as:
5. POST code errors - POST code errors are
caused by malfunctioning hardware components,
and are characterized by short beep sounds from
the tiny internal speaker of your motherboard.
POST code errors occur when you press the
power button to turn on your PC.
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21. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
OS errors can be classified into various
categories, such as:
6. Application errors - These can be caused at any
point of time. As the name suggests, these are
caused by applications while those are running.
These are usually caused by glitches in the
program code itself. These are usually resolved
by updating the program to its latest version.
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22. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
OS errors can be classified into various
categories, such as:
7. Browser Status Codes - These are caused by
problems faced by browsers when trying to
access a website. These can be caused by
misplaced web pages in the server of the website
itself, or due to connection problems.
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23. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
OS errors can be classified into various
categories, such as:
7. Browser Status Codes - For instance, a 404
error would indicate that the browser is trying to
access a webpage that does not exist in the
specified location.
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24. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
QUIZ
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25. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
QUIZ: Identify the following
1. What OS error is caused by
applications that have glitches in
the program code itself.
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26. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
QUIZ: Identify the following
2. What computer error results to
system restart over and over
again.
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27. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
QUIZ: Identify the following
3. What are caused by problems
faced by browsers when trying to
access a website?
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28. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
QUIZ: Identify the following
4. What computer error do you
encounter when you try going to
safe mode and all you see is a list
of files in Command prompt style.
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29. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
QUIZ: Identify the following
5. What OS error is usually caused
by corrupted driver files or
malfunctioning hardware
components?
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30. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
QUIZ: Identify the following
6. What computer error occurs when
nothing shows up in your monitor
and the LED indicator of your
monitor is flashing in yellow
color?
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31. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
QUIZ: Identify the following
7. What computer error causes your
system to automatically restart
and delete a file at random when
you move your mouse?
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32. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
QUIZ: Identify the following
8. What OS error is caused by
corrupted or malfunctioning
system files or software
executables?
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33. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
QUIZ: Identify the following
9. If your computer is infected by
aftershock virus, what would
show on your desktop even if you
are on standby mode?
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34. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
QUIZ: Identify the following
10. What OS errors are caused by
malfunctioning hardware
components, corrupted
operating system modules, etc?
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35. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
END OF
QUIZ
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36. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
ANSWERS TO QUIZ
1. Application error
2. Never ending loading of OS
3. Browser status codes
4. Safe mode doesn't work
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37. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
ANSWERS TO QUIZ
5. Device manager errors
6. No video output
7. Keyboard & mouse system restart
8. Runtime errors
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38. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
ANSWERS TO QUIZ
9. Pop-up windows
10. System errors
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39. z
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
End of
Module 4, Lesson 1: PLAN AND PREPARE FOR DIAGNOSIS OF
COMPUTER SYSTEMS ERRORS
TYPES OF COMPUTER SYSTEM ERROR
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