[ubuntu] Ubuntu LiveCD not booting to desktop

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http://ubuntuforums.org – I'm trying to boot into a macbookpro (4,1) using the liveCD to install gdisk and solve my multi-boot MBR issues. I can't "try ubuntu before installing" with the liveCD as it takes me to a black screen on my mac, nomodeset seems to load the drivers but it's welcoming me to Ubuntu 11.10 via command line - it won't boot into a graphical environment and I'm not sure why. The final line displayed is Welcome to Ubuntu 11.10 (Linux 3.0.0-12-generic x86_64) with a ubuntu@ubuntu:~$ cursor, and the liveCD boots into a GUI fine in another PC. Specs are a 4th gen MacBookPro, googling (Hardware)