There are a lot of boards with issues but here you left out that detail so my advice is to ask the motherboard maker what's up.
The problem at first was that the Ryzen 7 3700x I bought was, in fact, compatible with my motherboard, but the motherboard needed a bios update.I went to a friends house, borrowed their CPU, then updated the bios. I put my own CPU back in and after one failed attempt of turning it on, it worked. I was able to boot up the BIOS. What was that failed attempt you ask? Well the CPU cooler started, then stopped, started again, and then stopped--repeat. The weird thing was that it did it in sync with the fan mounted in the front of the case. Mind you all of the other fans were still working. I re-slotted the RAM after that first attempt, and that was when it worked and ran normally. I drive all the way home, thinking the problem was fixed, hook the computer up to my system, and then the same problem occurs... well half the time. Sometimes the CPU cooler starts and stops with the front fan as mentioned before, but sometimes it just stops at the beginning for a few seconds, then runs continuously. Looking at it closer, the GPU fan isn't working either, which is weird because it was working the very first time I turned it on. The DRAM_CPU LED on the motherboard remains on when the system is running as well. I looked into this extensively thinking it was the problem, but after seeing it boot at my friends house, I wasn't convinced. There isn't a problem in the vrm section, I reset the BIOS-and now updated them, tried different ram, and I reset the CMOS. Any help is greatly appreciated.