I have seen something similar last weekend...for some fun testing I wanted to install OPNsense 21.1 on a ASRock N3150DC-ITX with dual port intel NIC attached... same picture as thread starter - stuck at booting, but if you wait long enough it will beep at some point (what it usually does when it finished booting), but since there was no other output on the screen I cancelled this one...during that fun test I also tried at least two different USB drives and also burned a ISO to DVD, switched between USB 2 and USB 3; resetted BIOS settings; ...no success... maybe I should have tried to attach a network cable and see if another device gets an IP address after the "finished booting" beeps...