Having the same issue! Powers on, CPU debug light, no post, tried the same things.
Just sent a support ticket to MSI...
MSI B350M GAMING PRO (mATX)
Ryzen 5 1600x - Corsair h60 (water-cooled)
16gb g.skill f43200C 16D-16GVGB (COMPATIBLE according to MSI website)
1080TI founders edition
Wondering if bios update is necessary, judging by their bios notes, 2.5 says Ryzen 5 support.