I have the exact same issue. My computer was working fine for 2 months and out of nowhere it stopped working. I did a ton of tests and replaced every single part with working parts except for the CPU (Ryzen 5 3600) and the computer still will not post. My first MOBO had the VGA LED on and the second MOBO had the CPU LED on. I'm waiting to RMA my CPU because it seems like other people have had this issue too. It sounds like you should too and apparently it will take 5 weeks to process from when you first put in your request.