hi, i am new to mandriva 2009.1 i was checking out all the settings and things you can do and change. i changed the 3D desktop opp. from NO 3D desktop to 3D desktop and it needed to install packages so it did and it said i need to reboot for the changes. so when it booted up i have a white screen and a red curser, that's it. so my ? is how do i reverce this screwup?