[Xorg|Catalyst] Black screen

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https://bbs.archlinux.org – Hi !Firstly I'm French, and it's the first time I make a topic on Archlinux.org (and as an English Forum). Sorry for my English :s Here is my problem :I have a laptop with 2 graphics cards (ATI Mobility Radeon HD 4200 Series and Radeon HD 5650 ), and I want to use Catalyst for ATI's cards >= 5000 to use the Radeon HD 5650. The problem is when I run X with : "startx" (.xinit => "xterm & sleep 10") not with root, I have a black screen and a cursor of the tty top-left of the screen during the 10 seconds and I return on tty. I don't see error in Xo (HowTos)