Problem with Dell U2711

Hi there
I just took delivery of a new Dell 27" monitor and there's something wrong with the image at 2560x1440
I have it connected to my ATI Radeon HD 3870 Graphics card via a DVI cable
The image is all pixelated
Can anyone help?
Dell support is useless and keep asking me for a number that is not on the monitor
Thanks
Rob

Robert.  I am in the process of procuring my first iMac.  Stron preference toward the 27" iMac as it has teh dual Thunderboly ports.  I already have 2 Dell U2711 monitors which I will connect to my iMac to give me a 3 screen setup, but the show stopper is the resolution being limited on the Dell U2711's.  Did you manage to solve the resolution limitation with the screens being limited to 1920x1080 or did you manage to get them to run at 2560x1440?

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