Thanks , Christopher.

I upgraded the BIOS to version P08ABK via Windows 8, but now I have
worse problems.

First I got an "Image failed to verify with acess denied" error as soon as I 
turned the computer on.
I then ran boot-repair from an usb ubuntu boot, and I now have ubuntu working. 
(see http://paste.ubuntu.com/5952650/ for the repair info).
However, I've completely lost access to windows 8, with the error very similar 
to 
http://askubuntu.com/questions/280339/windows-8-wont-boot-via-grub-after-intalling-12-10-with-boot-repair
  (running the suggested fix does not work in my case though).

The black screen issue hasn't appeared so far, though. But I do have a
bigger problem to solve and no idea how to solve it.

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https://bugs.launchpad.net/bugs/1206282

Title:
  [Samsung Series 9 NP900X4C-A02PT] Black screen at login

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