Display Dark Lines
 

Over the last weeks I have had problems with the display
adapter and have tried the rebooting from Safe Mode and
have removed and reinstall the Display and Monitors which
has inproved things but I still have dark vertical lines
across the moniotor.I have tried ajusting the monitor
controles but no improvement.My display settings are at
32bit true colours 800*600p.but no settings seems to help
still dark lines. Any help please