Video card intel doesn't recognize screen

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http://forums.fedoraforum.org – Hi, i bought a new laptopt Gateway, core i3, intel video card. I've tested ubuntu and mandriva without good video results. I have installed Fedora 12, i'm using an external lcd samsung screen on the vga port, it works fine. My display properties shows two screen as well as the correct resolutions...the problem it that i can't use my latopt screen, i have tried different resolutions..but nothing. I can't use mi laptopt without an external screen. Even if i boot without my external screen, my laptopt screen goes black Could somebody give me some ideas about it? Thank you (HowTos)