No Sound From Headphones; Video And Monitor Problems; The Screen Is Blank; The Screen Is Difficult To Read - Dell OptiPlex 755 User Manual

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N S U R E T H A T T H E S U B W O O F E R A N D T H E S P E A K E R S A R E T U R N E D O N
speakers. If your speakers have volume controls, adjust the volume, bass, or treble to eliminate distortion.
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D J U S T T H E I N D O W S V O L U M E C O N T R O L
your screen. Ensure that the volume is turned up and that the sound is not muted.
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I S C O N N E C T H E A D P H O N E S F R O M T H E H E A D P H O N E C O N N E C T O R
disabled when headphones are connected to the computer's front-panel headphone connector.
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E S T T H E E L E C T R I C A L O U T L E T
as a lamp.
E
L I M I N A T E P O S S I B L E I N T E R F E R E N C E
interference.
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U N T H E S P E A K E R D I A G N O S T I C S
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E I N S T A L L T H E S O U N D D R I V E R
R H T
U N T H E A R D W A R E R O U B L E S H O O T E R
® ®
Microsoft Windows XP and Microsoft Windows Vista

No sound from headphones

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H E C K T H E H E A D P H O N E C A B L E C O N N E C T I O N
headphone connector (see the front and back views for the appropriate computer).
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D J U S T T H E I N D O W S V O L U M E C O N T R O L
your screen. Ensure that the volume is turned up and that the sound is not muted.

Video and Monitor Problems

CAUTION:
Before you begin any of the procedures in this section, follow the safety instructions in the
Information Guide
.
NOTICE:
If your computer came with a PCI graphics card installed, removal of the card is not necessary when
installing additional graphics cards; however, the card is required for troubleshooting purposes. If you remove the
card, store it in a safe and secure location. For information about your graphics card, go to support.dell.com.

The screen is blank

NOTE:
For troubleshooting procedures, see the monitor's documentation.

The screen is difficult to read

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H E C K T H E M O N I T O R C A B L E C O N N E C T I O N
• Ensure that the monitor cable is connected to the correct graphics card (for dual graphics card configurations).
• If you are using the optional
and monitor.
• Ensure that the monitor cable is connected as shown on the setup diagram for your computer.
• Remove any video extension cables and connect the monitor directly to the computer.
• Swap the computer and monitor power cables to determine if the monitor's power cable is defective.
• Check the connectors for bent or broken pins (it is normal for monitor cable connectors to have missing pins).
— Click or double-click the speaker icon in the lower-right corner of
— Ensure that the electrical outlet is working by testing it with another device, such
— Turn off nearby fans, fluorescent lights, or halogen lamps to check for
— See "Drivers" on page 356.
— See "Troubleshooting Software and Hardware Problems in the
— Ensure that the headphone cable is securely inserted into the
— Click or double-click the speaker icon in the lower-right corner of
—
DVI-to-VGA
adapter, ensure that the adapter is correctly attached to the graphics card
— See the setup diagram supplied with the
— Sound from the speakers is automatically
®
Operating Systems" on page 358.
Product
343
Solving Problems