MCSA/MCSE Self-Paced Training Kit (Exam 70-270): Installing ...

23-26 Chapter 23 Implementing, Managing, Monitoring, and Troubleshooting Hardware Devices and Drivers
mation about the sound card. You can launch the Sound Troubleshooter from the
More Help tab in the DirectX Diagnostic tool or from the Hardware tab in the
Sounds And Audio Devices program.
3. Correct Answers: B
A. Incorrect: The CD-ROM drive plays audio CDs through the speakers, and the
question gives no indication of other problems with the drive, so it is not clear that
replacing it will solve the problem.
B. Correct: When digital playback of audio CDs is enabled, the headphone jack on
the front of most CD-ROM drives is disabled. To use headphones to listen to audio
CDs, you have to either connect the headphones to a jack attached to the sound
card or to a headphone jack built into the speakers.
C. Incorrect: You can hear music through the speakers, so the CD volume and master
volume controls must not be muted or turned down. There is no volume control
specific to headphone jacks, so adjusting the volume levels in the Volume
Control program does not resolve the problem.
D. Incorrect: The Hardware Sound Acceleration Level has no effect on the volume
of audio CDs. Adjusting hardware acceleration on the Display and Sound tabs of
the DirectX Diagnostic tools might help to resolve stability or performance issues
relating to DirectX.
4. Correct Answers: A, C, and D
A. Correct: If the problem reappears on a different computer system, it is likely that
the USB hard disk is defective. If it performs as expected on the other computer,
the problem is specific to the original computer.
B. Incorrect: It is possible that having too many USB devices connected can cause
problems because there is not enough power available for all devices. There are
limitations on how much power each individual USB device can draw from the
USB chain; if a USB device tries to use more than 500 milliamps of current, the
port is disabled until the system is rebooted. The total amount of power used by
all the devices is also limited. However, the question states that you connected the
USB disk drive’s power plug, which means that it will not be using much current
from the USB connection. Additionally, USB mouse devices and Pocket PCs normally
use a trivial amount of electric current from the USB connection.
C. Correct: If this step resolves the problem, you have determined that the issue
was caused by the USB hub or its connection to your computer. Try power cycling
the hub and plugging it into an alternate port on your computer.
D. Correct: When Windows XP Professional detects problems with USB devices, it
writes error messages to the System event log. These messages can provide useful
troubleshooting information. Another important step to take when resolving