Hi,
Have you sort it out? I have the same problem. My machine posting different messages, one is saying to go and find my NAS using find.synology.com and the last one is saying as yours, "Booting Kernel" and stuck. I don't know if this should be or not the last message, the thing is, as in your situation, that I can't find NAS using find.synology.com.
Compaired with your situation, where you machine it worked for several months, for me I'm trying the finish an installation process, done step be step using this tutorial: youtube.com/watch?v=7IYSkiiYS5w
Have you sort it out sbv3000?