<facepalm> I'm so embarrassed.
Just checked the voltage on the PoE Adaptor. It's 48v.
I should have checked first but this dopey bugger assumed everything was 12v.
Now my stupidity has left me without my Pineapple. 8(
I'm absolutely not blaming anyone else, but I wish there were some kind of over-voltage protection.
Guess I need to start saving for the replacement.
Cheers, Jason