[all variants] Can't boot into Live CD. Hardware fault?

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http://ubuntuforums.org – Hi, I seem to have some kind of hardware problem. Windows crashed one day and I can't boot into it any more. Dell diagnostics give an error relating to hard drive failing/failure. The Windows CD wouldn't work so I tried to boot up a Ubuntu live CD, but that won't work either. Just get a blank screen after choosing to boot into linux :/ Anyone have any ideas? Surely if it were just a hard drive problem then I could still boot into the live CD? And then run a repair on the hard drive or something? Thanks in advance (Hardware)