please select proper bootable device

Hello I recently purchased a MSi RTX 2070 Ventus, and a Corsair Crystal 280x as an upgrade for my PC. The problem is, ever since installed my new parts, every few times I boot it up my PC, it says "Reboot and Select proper Boot device", and I know how to fix it, but every few times I boot up my...

Hi there, I recently did a build for a friend and ran into some slight issues. About 50% of the time when restarting the computer will fail to boot from the SATA III SSD main drive and display the "select proper bootable device" message, I can boot into the drive and OS easily by going into BIOS...