[ubuntu] Ubuntu 12.04 livecd won'd boot

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http://ubuntuforums.org – I just built a new computer and am attempting to install ubuntu 64 bit on it. I am able to get to the purple try ubuntu/install ubuntu/check disc to defects/... screen, but nothing I have tried will get me past there. It hangs on a black screen with a flashing cursor. I had installed an nvidia 550 ti video card, but removed it when i read several threads saying that the card could give me this error. Removing it did not solve the problem. The livecd works fine on my laptop, and the new desktop boots into a windows 7 install disk fine. What else can I try to get ubuntu to install? (Hardware)