is there an possibility to play crysis 2 with geforce 7900 gtx (sli) - game starts normal, but then the view change to black, sound keeps normal ... what can i do ?

I think you answered your own question ^^ NO ^^

lol no

you should be able to, after all crysis 2 is SOOO greatly optimized, and when i bought crysis 1 it played on my 7900 gs on low at 25 fps back in 2007, try latest drivers

isn't the minimum on the box a geforce 8800? I think getting it to run on anything lower than that is a real achievement as ..with my experience alot of more recent games are not really fully playable on the minimum spec ...like 15-20 fps no sorry i can't enjoy that

it should play with that those should have enough power and the game is well optimised. i didnt say it will run well but it should be...."playable" it just wont look real well i imagine. this game is totaly gpu based for the most part heck even a cheap-o gtx 250gts would work if you could get one of those and it would be better than BOTH those cards of your now in sli. and theyre cheap!

Can't really understand why it doesn't work though..

Another guy posted here with a similar laptop variant of the 78xx GT series and he reported the game starting normally, then a black screen, as well.