I can't get into my laptop anymore?

Help, I can no longer get into my computer because every time I replace it, a warning message appears that reads: Reboot and select proper boot device, or insert Boot Media in selected Boot device and press a key.

What can I do to make my computer work again, can someone help me?

Need a picture of the error message

Okay, how can you insert pictures here?

No operating system is found when the laptop is started. You should insert a boot medium (USB stick with Win 10, or a Win 10 DvD) so that you can boot.

Here it seems that something has been mixed up. Then go to the bios with (Del key, or F1, F2, F10 which is actually displayed when switching on)

the boot row curve change the hard disk in the 1st position. Save BIOS (will be displayed)

and quit. Restart laptop. If the message still appears, Windows must be reinstalled.

If you add the question there's a small icon where you can see a picture

press it down there

There's no hard disk in the boot menu that I can select. Only one option, but it doesn't work.

No, the boat menu is not crucial here. You have to go to the BIOS and the hard disk should be listed there. In the BIOS then go to the "Boot" tab (or similar)> then put the hard disk in the first place in the boot row.

All of this assumes that a hard drive is installed and connected