Reboot and select proper boot device or insert boot media in selected boot device and press a key

Hello, I bought new PC yesterday, and when i turning it on, screen showing me this sentence "reboot and select proper boot device" In BIOS it shows me the disk is connected. I tried even with CMOS, but nothing got changed. Any help pls? Motherboard: B450 gaming plus

Alright, so basically I bought a new laptop Asus X540U. Im not really familiar with computer booting but I really need everything explained because I tried everything I could. When I was at the shop, they said that the Windows 10 drivers must be installed. They gave me a disk but the laptop...