[ubuntu] Help! MacBook will NOT boot up Ubuntu install!

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http://ubuntuforums.org – Hello All, Here is the deal. I'm trying to dual boot Snow Leopard and Ubuntu on an old mac I have (It's a 2008 Core Duo Plastic Blackbook, version 4,1). I just purchased a new hard drive, installed it and put Snow Leopard on. I then partitioned the hard drive and installed rEFIt, which worked great. The problem is that when I try to insert the Ubuntu Live CD during restart, it will read it for a second and then spit it right back out. When I tried booting from a live USB, the Linux icon came up on rEFIt, but after clicking it I got the dOS-like screen saying "No Bootable Drives". (Hardware)