Home Assistant Yellow not responding

Hi!

I have a 1st gen Home Assistant Yellow that I want to reset to factory settings.

I followed the instructions given here:
https://yellow.home-assistant.io/guides/factory-reset/

… but that didn’t seem to work. So, I followed the steps described here:
https://yellow.home-assistant.io/guides/reinstall-os/

… and it all seemed to work fine. When powering up the Yellow after the process, the red and green LEDs light up for five seconds or so, then they go off … and that’s it. The yellow LED never turns on.

If I press and hold the red button while powering on the system, I do see the yellow LED light up, but all three lights turn off shortly after I let go of the red button.

Before all of this, I was using an NVME drive as the main storage. This drive has been removed. Does that have something to do with it?

Any help would be greatly appreciated!

Best regards,
Andrew