[gnome] Ubuntu 12.04: graphical errors on return from Suspension

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http://ubuntuforums.org – I've installed Ubuntu 12.04 from CD and I really prefer the GNOME desktop to Unity. However when I reactivate my HP Pavilion dv6000 laptop from Suspend Mode, after logging in, I've experienced consistent graphical errors to the point that I can no longer make out an icon from the other or restart the computer (see attached picture). I have an Nvidia GeForce 7400 graphic card so I installed the Recommended Additional Drivers of Nvidia. Can someone help me fix this problem, please? Any input is well appreciated. Attached Images ProblemiGrafici.jpg (Hardware)