Hi All I asked this before but got no reply , i just want to know why i get the black lines at the top and bottom on the screen when i play a blu ray or dvd film in 16:9 as my Dell Laptop is a 1920x1080 16:9 screen ? any ideas thanks 

What model is your Dell, it isn't an XPS is it?
Your film is probably 23:10 aspect ratio, as opposed to 16:19
What film is it?
What player do you use?
Is it just those two films?
Change the AR to all the other choices first of all, see if any of them do it.
"Black lines" otherwise known as Letterbox format