No Sound From Headphones; Touch Pad Or Mouse Problems - Dell Inspiron 640M Owner's Manual

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
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corner of your screen. Ensure that the volume is turned up and that the sound is not muted.
D 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.
E S T T H E E L E C T R I C A L O U T L E T
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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
for interference.
R E I N S T A L L T H E A U D I O D R I V E R
R U N T H E D E L L D I A G N O S T I C S
NOTE:
The volume control in some MP3 players overrides the Windows volume setting. If you have been listening
to MP3 songs, ensure that you did not turn the player volume down or off.

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
the headphone connector (see "audio connectors" on page 20).
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
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corner of your screen. Ensure that the volume is turned up and that the sound is not muted.

Touch Pad or Mouse Problems

H E C K T H E T O U C H P A D S E T T I N G S
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1 Click the Start button, click Control Panel, and then click Printers and Other Hardware.
2 Click Mouse.
3 Try adjusting the settings.
H E C K T H E M O U S E C A B L E
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and firmly reconnect the cable.
If you are using a mouse extension cable, disconnect it and connect the mouse directly to the computer.
O V E R I F Y T H A T T H E P R O B L E M I S W I T H T H E M O U S E
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1 Shut down the computer.
2 Disconnect the mouse.
3 Turn on the computer.
4 At the Windows desktop, use the touch pad to move the cursor around, select an icon, and open it.
If the touch pad operates correctly, the mouse may be defective.
R E I N S T A L L T H E T O U C H P A D D R I V E R
Click or double-click the speaker icon in the lower-right
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Ensure that the electrical outlet is working by testing it with another
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Turn off nearby fans, fluorescent lights, or halogen lamps to check
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See "Reinstalling Drivers and Utilities" on page 102.
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See "Dell Diagnostics" on page 81.
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Ensure that the headphone cable is securely inserted into
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Click or double-click the speaker icon in the lower-right
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Shut down the computer. Disconnect the mouse cable, check it for damage,
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See "Reinstalling Drivers and Utilities" on page 102.
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Sound from the speakers is automatically
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C H E C K T H E T O U C H P A D
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Troubleshooting
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