Every time I try to boot to USB or the hard drive (including the M.2 SSD), my Asus ROG STRIX H370-I GAMING motherboard keeps just booting to the BIOS.
I finally managed to fix this by upgrading the BIOS to the latest version (which was like version 804 or something), then turning on the CSM (I think it stood for Compability Something Mode 🙂 ).