Dell OptiPlex GX520 - Manual (Page 199)

Network Problems
Fill out the Diagnostics Checklist as you complete these checks.
Power Problems
Fill out the Diagnostics Checklist as you complete these checks.
1. Simultaneously press to display the Start menu.
2. Type u, press the keyboard arrow keys to highlight Shut down or Turn Off, and then press .
3. After the computer turns off, reconnect the mouse cable as shown on the in the Quick Reference Guide for your computer.
4. Start the computer.
Test the mouse — Connect a properly working mouse to the computer, and try using the mouse. If the new mouse works, the original
mouse is faulty.
Check the mouse settings —
1. Click the Start button, click Control Panel, and then click Printers and Other Hardware.
2. Click Mouse.
3. Try adjusting the settings.
If you are using a PS/2 mouse
1. Enter system setup and ensure that the Mouse Port option is set to On.
2. Exit system setup and restart the computer.
Reinstall the mouse driver
Run the Dell Diagnostics
Check for software and hardware conflicts
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
Check the network cable connector — Ensure that the network cable is firmly inserted into both the network connector on the back of the
computer and the network jack.
Check the network lights on the front or back of the computer depending on system chassis type. — No connection speed light indicates
that no network communication exists. Replace the network cable.
Restart the computer and log on to the network again
Check your network settings — Contact your network administrator or the person who set up your network to verify that your network
settings are correct and that the network is functioning.
Check for software and hardware conflicts
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
If the power light is green and the computer is not responding — See " Diagnostic Lights ."
If the power light is blinking green — The computer is in standby mode. Press a key on the keyboard or move the mouse to resume
normal operation.