ok, i felt for trying something new yesterday, i set up my settings in config menu, i really loved the graphics, so i didnt set them down again, no lag or anything :P Well, still havent had the black screen (two days, kinda much playing). Also, i completely turned of sleep mode, it might have helped actually, thanks ^^

for those wondering, even though this IS a laptop, it is also a gaming computer, even though the specs arent that great, fffxiv is running smooth. (Btw, was 64c* degrees last time the error popped up, so it wasnt overheating, as that happens at 120C*)

Of course, if the screen goes black again, il post here again, but before that, thanks for all help ^^ I might try some of the other stuff said here to, just to be certain it wont happen again :P