for getting it to work at the right resolution.
if you have windows 7 you can right click on the desktop and click screen resolution. then click the resolution dropdown and crack it up. if its not available there check the intel graphics driver software for its res changing section.
you monitor might need a driver installed. windows update generally find these but you can check dells website.
if you cant get anything from those ideas try a different type of cable they are crazy cheap from monoprice.com
Thanks for the info
When I try to add a new resolution using custom setting it said
>The Custom resolution exceed the maximum bandwidth capacity<
I have install the driver which come with the U2711
Have to try to buy a new display port cable tomorrow