GA-Z270X K5 - Hangs on splash boot screen when 2 lcds are connected

[redspear]

Hi,

My System is the following:
GA-Z270X K5
Core i7-7700K
Corsair H60
Crucial Ballistix Sport LT (2 * 8 GB)
Assus GeForce 1060
Dell UltraSharp 27" 5K

My Dell has two connections:
2 Display ports - for dual stream 5k 60 hz
1 Dispkay port - for 4k 60hz

Because I use my PC as a dual boot Windows 10 & Hackintosh I connected the NVIDIA dual display ports and the board single display port.

IF I connect all the cables with the computer turned on I can boot in both modes (5k & 4k).

When I turn off the PC and turn ON the computor stalls in boot screen (DEL - SETUP / F12 - Boot Menu) & freezes.

I have found out that the only way to overcome this is to disconnect the cable to the internal motherboard display port.

Is this a BIOS BUG? THis is the strangest thing that happened to me, motherboard related.

Must I change anything in the BIOS parameters?

Thanks,
Luis

[ElectroStingz]

Hello,

There are some issues with 20pin vs 19pin Display port cables, which type are you using?

19pin is the recommended one for connecting to a GFX card.

[redspear]

Hello,

There are some issues with 20pin vs 19pin Display port cables, which type are you using?

19pin is the recommended one for connecting to a GFX card.

How can I check that? I'm using the same cables to connect to my Dual Stream without any problem.

[ElectroStingz]

Do you see 20 pins or 19 when looking at it?


And are they both connected, test pin 20 to pin 20 with a multimeter.