IMac external display blurry/fuzzy

displayportimacsnow leopard

I've just got my new 2011 iMac (OS X 10.6.8), but connecting my HP LP2475w via a mini DisplayPort to DisplayPort cable leads to a very fuzzy screen. It's the correct resolution and refresh rate (1920×1200, 60Hz), and size-wise, everything looks fine on the monitor. However, everything, especially the text, looks horribly blurry. It's almost as if the iMac is outputting a 1920×1199 image or something, and the display is stretching it slightly. Like what used to happen with old CRT monitors when you set the image 1px too tall/wide.

Here's an image of what I see

And here's how it should look

enter image description here

Does anyone know what the issue could be?

Thanks!

Best Answer

You're not connecting with a VGA cable, are you? Mini Display Port to VGA adapter to VGA-in on the monitor? Because if so, it might very well BE approximating the resolution to an actual X-by-Y that isn't a native multiple of the screen pixels.

The giveaway about that is regular vertical stripes of fuzziness. Not the only giveaway, but if you have blurry streaks, you need a DVI cable.

EDIT: Reading your comments on the question, I'm now certain. Using DVI will solve this.

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