Did you try to press the reset button of laptop ?
You must use a needle to press that internal switch inside a little hole under 
the laptop ( laptop unpowered, then use the power cord to start it otherwhise 
will not start).
At least some other samsung users that were having acpi issues, could manage to 
unbrick the laptop. 
(But please follow samsung's instructions if any. I'm not responsible for any 
kind of damage)

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https://bugs.launchpad.net/bugs/1064759

Title:
  Samsung 900x4C will not POST after applying Quantal updates

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