Yeah, try try try try and try,
I failed during 2 days long, and yesterday (3rd day I was working on it) I managed to find the right bios combo settings + the righ sequence to boot up - reset - boot up - reset - boot up...
http://hwbot.org/forum/showthread.php?t=29770
It was really a pain, but at the end I did it, you need luck and lots of try/fail.
Today will go pick up 3L of LN2 and will try to improve the result. Hope will be lucky again.
Clue: Try different graphics cards