Having problems getting even the 7.1 live CD to run properly. I get a light blue screen with mouse pointer but then it drops out to black screen and stops doing anything.
Check the disk to see if its ok. Then digg around the ubuntu forms to see if this problem crops up else where. You may have to enter some paramaters. Press F6(?) when the ubuntu install menu is shown. Then here is a posible solution http://ubuntuforums.org/showthread.php?t=579393&page=2