Dell Precision T7400 - Manual (Page 49)

Quick Reference Guide 49
T E S T T H E E L E C T R I C A L O U T L E T — Ensure that the electrical outlet is working by testing
it with another device, such 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 — Turn off nearby fans, fluorescent lights, or
halogen lamps to check for interference.
R U N T H E S P E A K E R D I A G N O S T I C S
R E I N S T A L L T H E S O U N D D R I V E R — See "Drivers" in your User’s Guide.
R U N T H E H A R D W A R E T R O U B L E S H O O T E R — See "Restoring Your Operating System"
in your User’s Guide.
No sound from headphones
C 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 — Ensure that the headphone cable is
securely inserted into the headphone connector (see "About Your Computer" in your
User’s Guide).
A D J U S T T H E W I N D O W S V O L U M E C O N T R O L — Click or double-click the speaker icon
in the lower-right corner of 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 Product Information Guide .
NOTICE: If your computer came with a PCI Express 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 documentation.
C 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 a DVI-to-VGA adapter, ensure that the adapter is correctly attached to
the graphics card 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.