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Ubuntu 12.04 install/boot live cd blinking cursor

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http://ubuntuforums.org – I have a computer that I am trying to boot 12.04.3 (64 bit) from dvd. I can adjust boot settings ( I have tried nomodset,etc...) but when I try to run Live without installing I get a black screen with blinking cursor. Consequently, I have a live USB with 12.04.2 (32 bit) that I can boot from (although it takes almost 10 minutes to load). I don't think the problem is graphics card related since I can get computer to run on live usb disk. I have DVD-ROM plugged in on SATA3 A0. I have tried booting in both AHCI and IDE and I get same errors either way. The goal is to install ubuntu 12.04.3 AMD64 (Hardware)