Hello
Can you reach the first purple screen ?
If yes press any key to make the old menu appear, then press F6, press Esc, 
delete quiet splash and boot you pc in textual mode.
Thake a look where it stops  and refere.
thanks
Fabio

Can tyou also take a look here ?: https://wiki.ubuntu.com/DebuggingCasper
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https://bugs.launchpad.net/bugs/889852

Title:
  Live-CD black screen Radeon HD4200

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