I build a computer using entirely new parts (except for the video card with I used in my old computer for about a month before deciding to upgrade everything). When I turn it on the fans run and some lights turn on, but the screen is completely black and there is no beeping. I've never even gotten to BIOS. From what I could tell, this means that POST is not running. I took out the CPU and looked at the pins, but they all seemed straight to me. As far as I can tell, the PSU is hooked up correctly. The guides I have found say that the next step is to start replacing parts one by one until the situation changes. However, I don't have a bunch of compatible parts lying around that I can do that with. What should I do next?
Parts List
CPU: AMD Ryzen 5 3600
Motherboard: MSI MAG B550 Tomahawk
Video Card: MSI GeForce GT 1030
SSD: Samsung 970 Evo Pluss 500GB
RAM: Crucial Ballistix 8GB (two installed)