Problems with MBP late 2009 + Dell U2711 + DVI Dual-Link

Hi!
I'm new to Apple Communities. I've been using for quite a long time my MBP with my Dell U2711 monitor. Sometimes it works perfect. But other times, just after bootup or reasume the display doesn't work properly.
Some times it doesn't detect the signal of the MBP and doesn't start.
Other times it displays the right image but with something like "noise" in every color.
The only solution I found is to turn off and on the display or if it doesn't start, forcing it touching the menu button to start up. If it appears noise and I just change the source and put it back again it works fine.
It has only happened me with this computer. I have also used it with a custom made computer with a GTX280 and never had a problem with it.
I tried to boot up with the 2 different graphics cards my MBP has, and with both I have the problem. I even had the problem using the "normal" DVI adapter. I suppose it must be something of the computer firmware. Some times, if I restart the computer using only the U2711 display. The bootup logo and loading is displayed fine. But when it displays the login window the noise starts.
I've always had this problem. It isn't something that started happening one day. I even reinstalled Mac OS X.
I'ts really strange and I found nobody who has the same problem. I hope someone has a solution.
If someone doesn't understand what I call "noise", please, tell me and I will post a photo of it.
Thanks in advance (and sorry for my English)

Double posting. Everyone, ignore this here and follow that one instead.

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