Still having problems with my GTX 1060. Sierra won't boot if both monitors are plugged in.

I'm on 10.12.6 I've installed the web drivers for 10.12.6 (16G29) 378.05.05.25f01 I have a Gigabyte GA-Z77X-UD5H with an i5 processor In addition to the 1060 I also have a GTX 660ti My main monitor is a 4k displayport monitor. My second monitor is a DVI monitor.

So here's the deal. If I plug both monitors into either the 1060 or the 660ti the hackintosh seems to hang on boot. It isn't just that the screens are off because if I press the volume keys it doesn't make the toggle noise so I think it just won't boot into the OS if both screens are plugged in.

I CAN get both screens to work correctly but it involves booting only with my DVI monitor plugged in. After it has booted into the OS I can plug my second monitor into the displayport and everything shows up and operates as it should.

Has anyone come across this? Any solution to have the computer boot with both screens plugged in?

Thanks!