I downloaded the LMDE ISO, burned to a DVD (at slow speed) and booted. It starts scrolling text then the screen goes blank and the computer is locked up. In an attempt to isolate the problem I downloaded again from a different mirror. I used a different piece of software to burn this ISO to a different DVD disk. I got the same result as with the first attempt. I then tried to boot the live DVD from a different computer but the exact same thing happened. Both computers are less than three years old and have fast processors and plenty of memory. Any ideas?