Can you see anything when you first boot up the system, or does the black screen only apply when you load the OS?
If it's the former, then the issue probably lies with your motherboard. Try another graphics card if you have it on hand just to see if you can get any output from the PCIe slot. If the latter, then you will probably need to reinstall Windows.
Anyways, have you looked at this? There seems to be a lot of issues with this motherboard/BIOS configuration after the Raven Ridge launch.
I've run into similar issues on occasion but since your APU actually has a built-in graphics chip (Vega) I would actually recommend that you use the APU graphics until the drivers are completely removed. Use the video output on the motherboard (DVI or DP) temporarily and then run the uninstaller again, followed by DDU in safe mode. The computer should still boot up Windows if you keep the monitor on the motherboard video port. The system may prompt to auto-install the drivers but you can ignore that.
After this, shut the computer down normally and reinstall the graphics card; connect the monitor back to the card. You should be able to install the drivers normally now but if you still encounter problems feel free to post back. Good luck!
Unfortunately this ASRock AB350 board that the OP owns has no motherboard video output port, so he won't be able to explore this avenue.
Ah, I wasn't sure if it was an ITX model or not... my mistake.
I would try resetting the CMOS again, by removing the battery next to the audio ports for a few minutes and then trying again.
In that case, any series 1 Ryzen CPU would be of good use here. The platform can support the APU's with updates but this particular model, in lacking any sort of onboard video outputs on the I/O, can be problematic in this regard.
Your Asrock B350M has a newer BIOS update and possibly AMD Chipset Update: ASRock > AB350M
BIOS - 4.50 - 03/06/2018
AMD AIO Driver - 01/22/2018
The Ryzen 3 - 2200g requires a version BIOS of at least 4.40 which you have installed. Also make sure the memory you have installed is compatible with the Ryzen APU : ASRock > AB350M .
When you boot up, do you hear any other beeps instead of just one BEEP?