cpu and vga fans spinning, no post, black screen

You did have the computer off when you cleared them right? And did you do as beenthere suggested and pull the battery for a few seconds. Make sure you unplug the computer and push the power button first to clear any residual energy, then remove the battery for a few seconds and replace. Does the computer act like it's running, when you turn it on? You know, keyboard lights flickering, mouse lighting up, maybe a hdd indicator flickering. To turn it off do you have to hold the power button down for apprx 5/6 secs before it turns off or does it turn off as soon as you hit the power button for 1 sec? If it's the 1 sec deal then you're either in bios or they won't even load. Hope they didn't get corrupted the first time you reset them. If it's the 5 second deal then the computer is most likely running, you just don't see anything. If that's the case try re-seating the video card or try a temp video card. And make sure you plugged everything back up after taking it apart the first time. Might have missed a power plug of something simple hopefully.

For more solutions: https://iboysoft.com/data-recovery/windows-10-black-screen.html

Well, managed to test my cpu, ram and videocard with another board, all work ok, unfortunately the owner had an 3700x so I could not test my Asrock mobo itself. Still all is pointing to the mobo being somehow bricked. Strange that the fans are spinning on both cpu and vga, still no beeps from the speaker. :-(

Yes, well good intentions ... I wanted to do something similar but with a gaming cpu as it will be mainly used for gaming, so I've bought the 3300x, this is why I have upgraded the bios, the problem is that in the Node202 that cpu is very hot with the box stealth cooler and the nh-9La, in gaming was reaching 85-90C after one hour or so.I have reseated the cpu cooler several times, with no luck, the only acceptable temps were with the case open on the table. So the other option was to buy another cooler, like cryorig c7 or alpenfön black ridge, more money for an uncertain result. As the 1st gen Ryzen 1600 is "not recommended" to be run with the latest bios I've decided to downgrade and after some search I reached to that video. The rest you know. Thank you for the advice and stay safe.

Yes :-)

:-(, one mem stick I have already tried it, one by one in each dimm slot , also I am booting just with the hdmi and power cable, still no joy.