[ubuntu] live cd does not boot

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http://ubuntuforums.org – Hi, I am trying to install Ubuntu 12.04 on my Acer TravelMate 4001LMi laptop (at present running Ubuntu 10.04). Trouble is, it will not even begin to boot from the live cd. It just goes straight to the grub screen. I have tried with various other live cd versions, even the old 10.04 one, same result. I tried F12 for boot options and selected the cd drive, same result. Tried switching boot options in BIOS to boot first from the cd drive, same result. The cd drive works. If I put the live CD in once my computer has booted up, I can open it and explore its contents. I have used the same cd to in (Hardware)