Dell Latitude D820 Technical Manual page 64

No sound from headphones
Check the headphone cable connection — Ensure that the headphone cable is securely inserted into
the headphone connector.
Adjust the Windows volume control — 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.
Touch Pad or Mouse Problems
Check the touch pad settings —
1. Click Start→ Control Panel→ Printers and Other Hardware→ Mouse.
2. Try adjusting the settings.
Check the mouse cable — Shut down the computer. Disconnect the mouse cable, check it for
damage, and firmly reconnect the cable.
If you are using a mouse extension cable, disconnect it and connect the mouse directly to the
computer.
To verify that the problem is with the mouse, check the touch pad —
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.
Check the system setup program settings — Verify that the system setup program lists the correct
device for the pointing device option. (The computer automatically recognizes a USB mouse without
making any setting adjustments.) For more information on using the system setup program, see
System Setup Program.
Test the mouse controller — To test the mouse controller (which affects pointer movement) and the
operation of the touch pad or mouse buttons, run the Mouse test in the Pointing Devices test group in
the Dell Diagnostics (see
Reinstall the touch pad driver — See
Video and Display Problems
Fill out the Diagnostics Checklist (see
CAUTION: Before you begin any of the procedures in this section, follow the safety
instructions in the Product Information Guide.
Dell Diagnostics).
Reinstalling Drivers and
Diagnostics
Utilities.
Checklist) as you complete these checks.