PiDog v2 - Raspberry Pi now inaccessible

I’ve assembled my PiDog. The Raspberry Pi was configured beforehand - and I was successfully connected to the Pi through much of the assembly process. My connection is from my MacBook using Tiger VNC (since the Raspberry Pi Connect app is a bit flakey and slow to connect).

However, since powering down the Raspberry Pi and connecting the head assembly including the camera - my Raspberry Pi is no longer accessible via SSH, Tiger VNC or Pi Connect. The IP address used by the PiDog isn’t visible on my network. All the lights look okay.

Checking with Google Gemini it talks about known power issues on startup but I’m unsure how reliable that advice is. Can anyone confirm if there are known issues? Unfortunately I don;'t have a USB keyboard/mouse or screen to look at the Raspberry Pi directly.

Any advice?

Cheers