Asus booting issue

[ramin.mani222]

My Asus laptop shows this message while I turn it on.I tried changing boot order , still not working."Reboot and select proper boot device or insert boot media in selected boot device and press a key"

 

[TJ Hooker]

Either:

a) you've set the boot priority wrong, such that the drive with OS installed is not first
b) the laptop is not detecting the drive with the OS for some reason
c) there aren't any drives with an OS installed, or the OS installation is corrupted/damaged.

Is this a new laptop? Did it only start doing this recently? What OS is installed? What drive(s) does the laptop have?