[ubuntu] Gnome totally blocked

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http://ubuntuforums.org – Hi all, I am on Ubuntu 11.04 64bit on a notebook Dell XPS 16. I have an ATI Mobility Radeon HD 565v with proprietary drivers installed (fglrx). The problem I'm facing with is that sometimes when boot is going to complete or is completed, the graphical interface (gnome in my case) remains totally blocked and nothing works. I tried to wait a little but the pc seems completely gone. The only way to continue is to reboot manually with the power button. Even with CTRL+ALT+F1 I can't get into the terminal. Some months ago I had the same problem on the same pc, but with Ubuntu 10.10 64bit. (Hardware)