I'm looking for some assistance installing on a Mac G5 PowerPC..I burned the ISO for Precise Pangolin version. I have plenty of disk space and created a secondary partion on my primary drive. When I boot to the DVD to run the install I get the initial "Welcome to Ubuntu 12.04 LTS. After the "loading Ramdisk message, I get the white screen, then the next screen is a jumbled mess of color...I can hear the DVD spinning and thats it- no more messages. Any suggestions as to what I may have missed or am not doing?