- motherboard: MSI B450M mortar max
- cpu: AMD Ryzen 5 3600 6 core
(windows is installed in the m.2 ssd.
my pc was working fine up till this afternoon when it suddenly crased and showed the message "reboot and select proper boot device"
and when i went into bios, it only shows my secondary hdd. my m.2 ssd is not present in bios)
what should i do to fix this?