Also, you could use the command "XFdrake" at a console boot, and then it will start the video configuration. This has saved me on many times when I had video driver problems when booting. Add a "3" to the bootline and it will take you to a console boot, so will the "Safe Mode", I think, but I have never used the safe mode, yet.
Note: it is case sensitive. The command is XFdrake and not XFDrake.