C H E C K T H E M O U S E C A B L E —
•Ensure the cable is not damaged or frayed and check cable connectors for bent or broken pins. Straighten any bent pins.
•Remove any mouse extension cables, and connect the mouse directly to the computer.
•Verify the mouse cable is connected as shown on the setup diagram for your computer.
R E S T A R T T H E C O M P U T E R —
1 Simultaneously press <Ctrl><Esc> to display the Start menu.
2 Press <U>, press the up- and
3 After the computer turns off, reconnect the mouse cable as shown on the setup diagram.
4 Turn on the computer.
TE S T T H E M O U S E — Connect a properly working mouse to the computer, then try using the mouse.
C H E C K T H E M O U S E S E T T I N G S —
Windows XP
1 Click Start→ Control Panel→ Mouse.
2 Adjust the settings as needed.
Windows Vista:
1 Click Start 
→ Control Panel→ Hardware and Sound→ Mouse. 2 Adjust the settings as needed.
R E I N S T A L L T H E M O U S E D R I V E R — See the Dell Technology Guide on your computer or at support.dell.com.
R U N T H E H A R D W A R E TR O U B L E S H O O T E R — See "Hardware Troubleshooter" on page 135.
Network Problems
WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance.
C H E C K T H E N E T W O R K C A B L E C O N N E C T O R — Ensure the network cable is firmly inserted into the network connector on the back of the computer and the network jack.
C H E C K T H E N E T W O R K L I G H T S O N T H E B A C K O F T H E C O M P U T E R — If the link integrity light is off (see "About Your Computer" in the Setup and Quick Reference
Troubleshooting
