POSSIBLE SOLUTION!!!???
so 4 days ago i rolled back my drivers and finally installed the oldest intel driver which i could find on the asus support page. and surprisingly it seems to work now. since then i haven't had a single black screen. before, my screen was black with every boot routine etc.
so here's the version that seems to work for me:
8.15.10.2761 (date: 21.05.2012)
hopefully it stays like this until intel finally finds a solution for this issue! i cannot believe it to be so difficult!!!
dan