Dell 2412M Ultrasharp Issues

Hi,

So I have a Dell 2412M Ultrasharp monitor, currently it is connected via mini display port adaptor to DVI cable to my 2010 MBP (2.66 i7, 8GB, 256 SSD, NVIDIA GT 330 512GB, Hi Res Anti Glare) running Mountain lion.

I am experiencing a couple of display issues.

1.) Very fine vertical banding. This is only really apparent when darker colours are displayed on screen. Best example would be the general CS6 interface.

2.) Flickering when displaying expanses of white. Best example, this website.

I also have a 2008 Mac Pro (2.8 Xeon Octo, 10GB, 128SSD, 2x 1TB, 1x500Gb, FLASHED HD 4870 1GB, 2600XT 256GB, ML). When connected to this setup I get the exact same thing, using either video card. But here's the thing; when I launch bootcamp / Windows 7 I don't have the same problem, I've tested using
a range of different solid coloured wallpapers and they all display correctly.

I have the app Switchresx on both machines and have tried tweaking a couple of settings like the refresh rate etc but I will hold my hands up and say that I don't know what I am really doing here i just wanted to see if I could make a difference.

It's worth mentioning that I have also tried a couple of different monitors that I have knocking about and they also display fine, so it must be something between the Mac / Mountain Lion / 2412M Monitor.

Can anyone offer any ideas to fix this? I'm a graphic designer by trade so it's quite critical that solve the problem.

Thanks in advance,

Ben

 

Curious how you are connecting it like that as the monitor doesn't have a HDMI input?

 

WOW

Unbelievable. Fixed!

It's like looking at a new display, thank you SO much!

 

Just curious, why is it that i was experiencing the same issues on the Mac Pro with both it's ATI cards?