With Mac devices you should check "nonodeset" box. In the main screen of livecd press F6 then check "nomodeset". After finishing installtion, choose linux in the rEFIt screen after that press key e in the command line screen to edit it and add the word "nomodeset" before two spaces before "quitsplash" word then press F10 to start temporary. Finally edit the file grub.cfg and add the word "nomodeset" before two spaces before "quitsplash" word to make it official^^ then save it.
sudo gedit /boot/grub/grub.cfg