I just picked up a  http://forum.asrock.com/forum_posts.asp%3cTID=9701&title=fatal1ty-b450-gaming-k4-fan-control-doesnt-work" rel="nofollow - Fatal1ty B450 Gaming K4  with a Ryzen 2600. I can not get the motherboard to post. All it does is continually reset about ever 15-20 seconds. 

I've tried removing every other component except GPU and PSU and checked every process I can think of and i'm out of ideas. Anyone have anything I should be looking at?

Are these motherboards not compatible with ryzen 2600's out of the box? Do they need a bios update? I was under the understanding they would work without having to do the bios update first 

if it resets  every 15-20sec, then bios is trying to get your RAM stable

it can take even 5 minutes as your is not compatible

it has to shuffle between several preconfigured timings

and it will do so untill it boots...so let him do his thing...

once u manage to boot, it will be much faster (as it will already know what it has to use)

if it will take longer than 5 min, try it with only 1 stick in A2 slot

if u boot (can take a while), go to bios and set xmp and reduce frequency to 2133, then save it and shutdown and add second stick to b2 (if u have)

I finally swapped out the ram sticks and did one at a time in A2 and low and behold only one stick will successfully boot, the other resets over and over and never finds a good configuration.