Problems with my second monitor after upgrading to Mountain Lion

Basically I have a Mac Pro 8-core with two video boards (2 x NVIDIA GeForce GT 120 512 MB) connected to two monitors. After upgrading to the Lion Mountain, 90% of the time when I start my MAC the second monitor doesn't show it image, keeps in full black screen, what puzzle me is, I can see the mouse arrow on it, so its alive, but its in black, than I have to restart the computer over and over again until it finally make the second shows it contains.
Have anyone experienced the same problem?!

Hello Carlo!
Sorry but I don't understand which part of my question is not clear. I've been to the Apple Store, they asked me to bring my 20kg Mac Pro and both 24" inches Eizo monitors to central London to have it checked. Well, honestly, this is impossible, is an invitation for an accident.
Is just unbeliavable that no one has experienced my problem, looks like I am the only one person with two monitors using the Lion Mountain.

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Problems with my second monitor after upgrading to Mountain Lion

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