not sure. did you install video drivers? i had this problem with nvidia's new installer. i got them installed, configured XF86Config-4, and blam! didn't work. just got a bunch of plasma blobs. so i installed the old drivers. the thing is i didn't uninstall the new nvidia drivers, and there was a conflict that occured with the same error message you got only i got nothing except for the blank blue background. the thing you have to do is uninstall the new nvidia drivers before going back and installing the old ones. if it isn't this, then i have no clue except a reinstall.