Meh, My non chuffyness started yesterday when I went to put some new LED lights in a display cabinet, pulled the roll of smd's out, got the controller out, got the adapter out, put it all together, lights went mental, Hmm, try different set of lights, same issue, try different controller same problem, check polarity of adapter all good, Try 1 more controller, nope, OK last controller, change PSU, yep it works, hmmm, connect to old PSU, same problem, reconnect to new PSU, same problem. Look at old PSU, Yep that's not a 12V adapter for LEDS its a Bloody 48V adapter for POE,
At least replacement controllers are only a couple of quid each.