I have a Ryzen 5 3600 and a Gigabyte B450m DS3H V2 motherboard. GPU is a Radeon Pro WX2100 from ebay that the seller claims he's tested. RAM is a 2x16gb kit clocked at 3200MHz. I assembled the PC the day before yesterday, and it wouldn't post at all. Tried taking out the ram modules and testing them individually (same board, I don't have access to another pc atm, just this laptop), and tried changing the GPU slot. When that didn't work I just left it alone until this morning, and upon pulling the CPU out I noticed some thermal paste on the socket and pins, but it wasn't much and I cleaned it off using a toothbrush with some rubbing alchohol on it. I also tried a CMOS clear just in case, and I still don't get any video output. I'm also noticing that the GPU seems to take 15-20 seconds to turn on after the rest of the system, but I have no way of testing the cpu or ram.