In this section, you learn that to troubleshoot a problem quickly and effectively you need to have of theory of how to approach the issue. Troubleshooting is a way of discovering what is causing a problem and fixing it.

1. Troubleshooting
Process

2. •A data backup is a copy of the data on a
computer’s hard drive that is saved to another
storage device or to cloud storage.
• Cloud storage is online storage that is
accessed via the Internet.

3. • Open-ended questions allow customers to explain the
details of the problem in their own words. Use open-
questions to obtain general information.
• Closed-ended questions generally require a yes or no
answer.

4.  It displays all the devices that are configured on a computer.
 The operating system flags the devices that are not operating correctly with an error
icon.
 A yellow circle with an exclamation point (!) indicates that the device is in a
problem state.
 A red circle with an X means that the device is disabled.
 A yellow question mark (?) indicates that the system does not know which driver to
install for the hardware.

6. It displays the applications
and background processes
that are currently running.
 With the Task Manager, you
can close applications that
have stopped responding.

7. You can also monitor the
performance of the CPU and
virtual memory; view all
processes that are currently
running, and view information
about the network connections.

8. Identify the Problem Probable Cause • Possible Solutions
The computer does
not recognize a storage
device.
 The power cable is loose.
 The data cable is loose.
 The jumpers are set incorrectly. The
storage device has failed. The storage
device settings in
 the BIOS are incorrect.
• Secure the power cable
• Secure the data cable
• Reset the jumpers
• Replace the storage device
• Reset the storage device
settings in the BIOS
The computer fails
to recognize an optical disc.
 The disc is inserted upside down.
 There more than one disc inserted
into the drive.
 The disc is damaged.
 The disc is the wrong format. The
optical drive is faulty.
 Insert the disc correctly
 Ensure there is only one disc
inserted in the drive
 Replace the damaged disc Use
the correct type of disc Replace
the faulty optical drive
The computer will
not eject the optical disc.
 The optical drive is jammed.
 The optical drive has been locked by
software.
 The optical drive is faulty.
 Insert a pin in the small hole
next to the eject button on the
drive to manually open the tray
 Reboot the computer
 Replace the faulty optical drive

9. The computer does
not recognize the removable
external drive.
 The removable external drive
is not seated properly.
 The external ports are disabled
in the BIOS settings.
 The external drive is faulty.
 Remove and reinsert the drive
 Enable the ports in the BIOS
settings
 Replace the removable
external drive
A media reader
cannot read a memory card that
works properly in a camera.
 The media reader does not
support the memory card type.
 The media reader is not
connected properly.
 The media reader is not
configured correctly in the
BIOS settings.
 The media reader is faulty.
 Use a different memory card
type
 Ensure the media reader is
connected properly
 Configure the media reader
correctly in the BIOS settings
Install a known good media
reader
Retrieving or saving
data from the USB
flash drive is slow.
 The motherboard does not
support USB 3.0.
 The port is not set to the
correct speed in the BIOS.
 Update the motherboard or
USB
flash drive to support USB 3.0
 Set the port speed in the BIOS
setting to a higher speed

10. Identify the Problem Probable Causes Possible Solutions
The clock on the computer
is no longer keeping the correct
time or the BIOS settings are
changing when the computer is
rebooted.
 The CMOS battery may
be loose.
 The CMOS battery may be
failing.
■ Replace the battery
■ Secure the battery
After updating the BIOS
firmware, the computer will not
start.
The BIOS firmware update
did not install correctly.
Contact the motherboard
manufacturer to obtain a new
BIOS chip. If the motherboard has
two BIOS chips, the second one
can be used.
The computer displays the
incorrect CPU information when it
boots.
 The CPU settings are not
correct in the advanced
BIOS settings.
 BIOS does not properly
recognize the CPU.
 Set the advanced BIOS
settings correctly for the
CPU
 Update the BIOS

11. The hard drive LED on
the front of the computer does not
light.
 The hard drive LED
cable is not connected or is loose.
 The hard drive LED cable is
incorrectly oriented
to the front case panel connections.
 Reconnect the hard
drive LED cable to the motherboard
 Correctly orient the hard drive LED
cable to the front case panel
connection and reconnect
The onboard NIC has
stopped working.
The NIC hardware has failed. Add a new NIC in an open
expansion slot
The computer does not
display any video after installing a new
PCIe
video card.
 BIOS settings are set to
use the onboard video.
 The cable is still connected to the
onboard video adapter port.
 The new video card is faulty.
 Disable the onboard video
in the BIOS settings
 Connect the cable to the new video
card
 The new video card needs to have
auxiliary power connected
 Install a known good video card
The new sound card does
not work.
 The speakers are not
connected to the correct jack.
 The audio is muted.
 The sound card is faulty. BIOS
settings are set to use
the onboard sound device.
 Connect the speakers to the
correct jack
 Unmute the audio
 Install a known good sound card
 Disable the onboard audio device in
the BIOS settings

12. Identify the Problem Probable Causes Possible Solutions
The computer will not
boot or it locks up.
 The CPU has overheated
 The CPU fan is failing
 The CPU has failed
 Replace the CPU
 Reinstall the CPU
 Replace the CPU fan
 Add fan(s) to the case
The CPU fan is making
an unusual noise.
The CPU fan is failing. Replace the CPU fan.
The computer reboots
without warning, locks up, or
displays error messages.
 The front-side bus is
set too high.
 The CPU multiplier is set too
high.
 The CPU voltage is set too
high.
 Lower the front-side bus is
settings
 Lower the CPU multiplier
settings
 Lower the CPU voltage
settings
 Reset to the factory default
settings for the motherboard
to revert all previously changed
settings to motherboard
specifications

13. After upgrading from a
single core CPU to a dual core CPU,
the computer runs more slowly and
only shows one CPU graph in the
Task Manager.
The BIOS does not
recognize the dual core CPU.
Update the BIOS firmware to
support the dual core CPU
May need new motherboard and
chip set
A CPU will not install
onto the motherboard.
CPU is the incorrect type. Replace the CPU with a CPU that
matches the motherboard socket
type.
The computer does not
recognize the RAM that was added.
 The new RAM is faulty.
 The incorrect type of
RAM was installed.
• The RAM that has been added is
not the same type of RAM already
installed.
 The New RAM is loose in the
memory slot.
 Replace the RAM
 Install the correct type of
RAM
 Match the new RAM with the
existing RAM type
 Secure the RAM in the memory
slot
After upgrading
Windows, the computer runs very
slowly.
 The computer does not
have enough RAM.
 The video card does not have
enough memory.
 Install additional RAM
 Install a video card that has more
memory

14. Identify the Problem Probable Causes Possible Solutions
Display has power but no
image on the screen.
 Video cable is loose or
damaged.
 The computer is not sending a
video signal to the external display.
 Reconnect or replace video
cable
 Use the Fn key along with the
multipurpose key to toggle to the
external display
The display is flickering.  Images on the screen are
not refreshing fast enough.
 The display inverter is damaged or
malfunctioning.
 Adjust the screen refresh rate
 Disassemble the display unit and
replace the inverter
The image on the display
looks dim.
 The LCD backlight is not
properly adjusted.
 Check the repair manual for
instructions about calibrating the
LCD backlight.
Pixels on the screen are
dead or not generating color.
 Power to the pixels has been
cut off.
Contact the manufacturer
The image on the screen
appears to flash lines or patterns of
different color and size (artifacts).
 The display is not
properly connected.
 The GPU is overheating. The GPU is
faulty or
malfunctioning.
 Check connections to the
display
 Disassemble and clean the
computer, check for dust and debris
Replace the GPU

15. Color patterns on the
screen are incorrect.
 The display is not
properly connected.
 The GPU is overheating.
 The GPU is faulty or
 malfunctioning.
 Check connections to the
display
 Disassemble and clean the
computer, check for dust
and debris
 Replace the GPU
Images on the display
screen are distorted.
 Display settings have
 been changed.
 The display is not properly
connected.
 The GPU is overheating. The
GPU is faulty or
 malfunctioning.
 Restore display settings to
the original factory settings
 Check connections to the
display
 Disassemble and clean the
computer, check for dust
and debris
 Replace the GPU
The display has a “ghost”
image.
The display is experiencing
burn-in.
 Power off the display and
unplug it from the power
source for a few hours
 Use the degauss feature if
available
 Replace the display

16. Identify the Problem Probable Causes Possible Solutions
The images on the display
have distorted geometry.
 The driver has become
corrupted.
 The display settings are incorrect.
 Update or reinstall the driver in
safe mode
 Use the display’s settings to
correct the geometry .
The monitor has
oversized images and icons.
 The driver has become
corrupted.
 The display settings are incorrect.
 Update or reinstall the driver in
safe mode
 Use the display’s settings to
correct the geometry
The projector overheats
and shuts down.
 The fan has failed.
 The vents are clogged. The projector is in
an
enclosure.
 Replace fans
 Clean the vents
 Remove the projector is in an
enclosure or ensure proper
ventilation

17. In a multiple monitor
setup, the displays are or aligned or are
incorrectly oriented.
 The settings for multiple
monitors are not correct.
 The driver has become corrupted.
 Use the display control panel
to identify each display and set the
alignment and orientation
 Update or reinstall the driver in safe
mode
The display is in VGA
mode.
 The computer is in
Safe Mode.
 The driver has become corrupted.
 Reboot the computer
 Update or reinstall the driver in safe
mode