U2713H Colors variations (with MacbookPro)

Hi there (sorry about my english..)

I use a Dell U2713H with a Macbook Pro (i5 / 8gb ram / Intel HD3000 video / OS X Yosemite) connected through MiniDisplay Port to DisplayPort cable (Dell´s cable).

When I "save for web" in Illustrator, the colors look really bad, like washed out, with no vibrance.

The rare thing is that if I turn off the monitor and use the Mac alone, it works and looks fine, what I do in Illustrator looks exactly the same in Chrome for example or any JPG file viewer.

I thinks it´s something about the profiles or the calibration maybe?

Screen (look the reds, right hand the export window, left hand the original file):

Image may be NSFW.
Clik here to view.

Thanks a lot,