HP Vectra XU5 Getting Started Manual page 49

If Your Application Screen is Blurred
Check that the display is properly connected to the PC.
If you changed the display resolution in Windows, you may have selected a resolution
which is not supported by your display.Restart the PC from a diskette containing the
operating system, then run Windows Setup from the C:\WINDOWS directory and change
the video resolution. (Refer to the Setting Up Your PC manual, supplied with your PC.)
HP Vectra XU – Getting Started If You Have a Problem with Your PC 49