My work Laptop had a problem with Fedora 10, I was not able to start the X graphical environment. After a quick Google search I found the solution at Adobro Online.
Basically, the X-server gets confused because of the two graphic cards in the Laptop. Just disable the "Switchable Graphics" option in the BIOS ("Display" section) and select e.g. the "discrete" graphics as default and you are good to go. It though seems that the ATI graphics driver does not yet support graphic acceleration features, so you might want to switch to the "integrated" graphics card if you need the extra acceleration.