Problems with TR4

I've got some tiny problem with my TR4 build:

ASROCK Taichi x399

GTX 1070 iChill

32 GB Corsair Vengeance
Samsung 970 Evo 

Threadripper 1920X

btw. every part was taken from the official support Lists.

- My Radiator fans just keep bumping up and down - almost live a waving. I think this is, because they are plugged into the mainboard and turn them on regarding CPU load - is there any other option to configure this? Like for the Watertemperature? - btw I'm using Enermax TR4 280mm

- This is a bit more tricky. Sadly the ASRock support won't help me either (waiting for over a week for a response now):

Whenever I power on the Computer, the ASRock-Logo appears and the System seems to freeze, because any inputs are neglected and I cant do anything. After about 10-12 seconds the PC starts to boot just fine and accepts inputs for instance to get into the BIOS.

I checked the BIOS Version -> Up to date

I checked the DebugLEDs -> No looping, no hanging, everything alright

I tried reinstalling everything -> Same problem

I tried only 1 RAM -> Same problem

I tried setting the offtimer in the BIOS to 10 seconds -> Same thing, screen "freezes" for like 10 seconds, and then waits the expected 10 seconds for an Input and THEN starts to go into windows. 

No ideas left... do you have some?

Everything else works perfectly fine and no problems

Sorry for my bad english, I am not a native speaker, but hope my points came across :)

Thanks in advance.