Can't install / won't boot installer / restart on apple logo after one second

[wildwillow]

Yes I've read many threads and carefully updated & installed. It all worked out great in the end I've never seen such a powerful mac haha

Just need to find a solution for my multi monitor setup now, do you maybe know?

I don't have the hardware to test with multiple screens with the 9XX So my advice is to use search. I have multiple monitors working with Nvidia, non Maxwell. You might just have to wait it out as there is no native support.