Gnome Shell only works when using external monitor

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http://forums.fedoraforum.org – Hello, I have an Toshiba Tecra R950 with F17 x86_64. At work I have it connected to an exteranl LCD monitor trhough the Display Port and I have NO problem with this configuration (dual monitor, closing the laptop and using only the external etc.). I also connect it to a USB keyboard and mouse. This laptop comes with a Radeon HD 7570M and I am using the Xorg radeon driver. Ironically, when I boot without external monitor (using just the LCD/LED screen) the GNOME Shell crashes on login with the "Something have went wrong" message. I do not see any relevant message either in s (HowTos)