I've tried 2 different ISOs (one that I burned and a copy from eBay) and tried nearly every bootloader option when I boot from the Live CD. All i get is colored horizontal lines and no text on the screen after I enter a boot option. I can hear the disc spinning like it's trying to load something but it seems there is something wrong with the graphics.
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Try using the PowerPC version of Ubuntu. Intel versions won't work right with PowerPC computers.
These are the official links from cdimage.ubuntu.com .
Read the PowerPC support page on the Ubuntu Wiki for more information.

Emerson Hsieh
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Both discs are PowerPC, but I will try the 12.04 Alternate ISO. – Andrew Jun 14 '12 at 06:03