Hey, i have a new mid-2010 i5 iMac with a radeon 5750 processor, and would like to run linux on it, however, ubuntu 10.10 isn't working, i get through the whole install, and restart, and it won't boot. i've installed rEFIt, and it shows up as installed on the drive, but won't boot to anything but black with a flashing white line on the top left. any ideas, or known compatible working version?