MSI Z170A Gaming Pro and DDR 2x8 issue

[dusk20]

I have a problem starting my build with 2 memory sticks in 2nd and 4th memory slots. On startup DRAM LED lights on and no image on screen. However if i put only one plank in slot 2 then it's ok. Both planks work, so issue probably isn't in the memory.
I am using Kingston DDR4-2666 PC4-21300 (kit of 2x8192) HyperX Fury Black (HX426C15FBK2/16) memory.
Can someone suggest what may cause this?

 

[dusk20]

Issue solved, updated BIOS from 1.3 to 1.6

 

[rgd1101]

There another bios update coming to fix skylake cpu issue
http://www.tomshardware.com/news/skylake-prime-number-bug,30979.html

 

[dusk20]

Thanks, will keep in mind.