My MacBook Pro is not displaying anything (even on an external display), but it is otherwise running. I think it has to be a problem with the graphics card I used last (9600M GT). I'm trying to switch to the 9400M right now using VoiceOver (text to speech), but for some reason, the computer is not aware of the two radio buttons for "Better battery life" and "Higher performance," which are used to switch between graphics cards, in the Energy Saver window. Does anyone know if there is a terminal command or some way, other than through Energy Saver, to switch between graphics cards? Any help is GREATLY appreciated. I'm at school right now and really cannot afford to have my computer out of commission. Thanks very much.