What model of Xerox LCD monitor do you have?
What is your refresh rate set to?
How to Check Your Refresh Rate
Click the Start button
Click the Control Panel menu item
Click the Display icon
Click the Settings tab
Click the Advanced button
Click the Monitor tab
Also, when it shows you the screen refresh rate, does it give you other options to change the refresh rate to?
What resolution are you currently running at?
How to Check Your Refresh Rate
Click the Start button
Click the Control Panel menu item
Click the Display icon
Click the Settings tab
Do you have a spare PC or a spare monitor to use to attempt to isolate the issue to a single component?