I am trying to set up a dual boot Ubuntu/OS X on my 2009 Macbook Pro (the gfx card is a nvidia 9400m). I followed the tutorial here and everything seemed to be going okay (install was successful), but when I try to boot to Linux it goes straight to a black screen with blinking underscore in the top-left corner of the screen. I tried the two solutions from this thread, but neither of those solutions (boot repair and re-install grub) have worked. After trying both solutions, the boot will hang up at the "penguin" screen on rEFIt once. Then I shut down and boot up again and from all attempts forward it goes to the black screen.
I've checked and rEFIt says my partition tables are sync'd (if that helps, at all). Here is the latest report from boot-repair, after I re-installed GRUB: here
Thanks for your help; I'm just starting to learn linux so any help would be much appreciated!