I'm trying to dual boot osx and some linux distro (probably xubuntu or ubuntu since I'm new to linux), but I can't get my macbook pro to boot from the install disk. Using rEFIt, I boot up the computer and choose to boot from the linux cd. Then I just get a black screen with a white cursor. The disc drive spins for a bit, and then it shuts off and nothing happens. I can install and run xubuntu/ubuntu/anything-I-want in a Virtual Box machine, but I can't get my computer to boot from the media. It shouldn't matter if its' on DVD or CD should it? Has anybody else had this problem? I've googled the tar out of this problem and can't find any answers. Also, does anybody have a good guide to doing this? I've read a dozens of them, and they're all different, I don't know which one to go off.