Problem booting qubes 4.0.3

Hallo,
I installed qubes 4.0.3 from usb to my laptop acer swift 3 ryzen 5 4500u, bios version 1.07. This is the only OS that is installed. After installation and restart the computer says NO BOOTABLE DEVICE , and booting stops. What can I do to fix it.(i am a linux beginner).

Thanks