Rock does not seem to be in play yet. The BIOS needs to find the bootable disk first, then it hands off the control to the operating system that is installed on this disk (the RoonOS of Rock in this case). However, it doesn’t even get that far.
This sounds like an issue with the BIOS or its installation. Intel has some instructions here, but they are not very comprehensive:
Please take photos of what you see in the BIOS and post them here.
Most likely, the noise you heard before the BIOS update was already part of the problem, maybe the NUC was already failing. What kind of noise was that?
To repeat/confirm - this setup has worked flawlessly for 2-3 years. I installed it all from scratch. A recent BIOS update seems to have killed ROCK’s ability to recognise the M2 card. The BIOS update installed fine and I can boot into BIOS with no issue. All BIOS settings are correct. The M2 card is displayed in BIOS under Devices > SATA - but not listed as a boot drive.
I am pretty tech-savvy (I’ve built and configured Unix servers for years) and it looks very much to me like the issue is with ROCK.
Thank you: disabling UEFI and enabling Legacy Boot does show the M2 card as a boot drive - but setting it to boot from that drive (i.e. no. 1 priority) results in a “Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key” error.
Interestingly I also get this error if I try to start from a ROCK factory reset image on a USB stick.