The touchpad on the Dell Latitude D600 is integrated into the top cover on the notebook. If the touchpad doesn't work after booting to the operating system, the device driver for the touchpad could be disabled or corrupted, or the touchpad could be disabled in the Basic Input/Output Software, the program that controls the function of computer hardware at start-up. If the Latitude D600 touchpad doesn't work after troubleshooting the device, run Dell Diagnostics on the mouse to check for problems.
Connect a USB mouse to one of the USB ports on the side of the Dell Latitude D600. Turn on or restart the computer. Windows should auto-detect the mouse.
Click "Start," then choose "Run." Type "devmgmt.msc" and press "Enter" to open "Device Manager."
Click the "+" icon next to "Mice and Other Pointing Devices." Right-click the touchpad device. Select "Enable" from the context menu, if available.
Double-click the touchpad if the option to enable the device is not shown in the context menu.
Check the "Device Status" field on the "General" tab for errors. If an error code is shown, go to Microsoft Support and follow the instructions on the website to resolve the error.
Exit from Device Manager. Restart the computer. Press "F2" on the boot screen to go to system set-up.
Press "Alt" and "P" three times to go to the "Basic Device Configuration" screen. You will pass through the main screen and the "Boot Order" and "Boot Configuration" screens. Scroll down to the "Pointing Device" option.
Use the right- and left-arrow keys to change the option to "Touch Pad - PS/2 Mouse" if the option is not selected already.
Press "Esc." Highlight "Save Changes and Exit." Press "Enter" to enable the touchpad and restart the computer.
Turn on or restart the Dell D600. Press "F12" when the Dell boot screen appears. Go to "Boot to Utility Partition" and press "Enter."
Press any key to continue when prompted. Select "Custom Test" on the "Main Menu" screen.
Click the "+" icon next to the "Pointing Devices" menu to expand the category. Select "Mouse Test" from the options.
Click "Run Test." Review the information in the "Results" tab when the test is complete. If an error was detected, follow any on-screen directions to fix the touchpad on the Dell Latitude D600.
To confirm that you're on the "Basic Device Configuration" screen, check the left side of the header. It should read "Page 4 of 7."