Stickip cam was working fine via wifi until i tried swapping to POE now unresponsive

Hi, I have a wired stickup cam black and since trying to connect via POE, the cam will no longer respond. Will not go into setup mode have tried everything read all pages relating to this problem. Nothing has worked and will not even connect via wireless like it did in the beginning. Please help really frustrated. I actually sell these products at my work and always recommend them as i also have the doorbell. Thought the cams would be as good? Is this a common thing? I have found some similar topics on onthe sites and none have a solution other than resetting by holding button for 20sec or trying a different power outlet. Both i have tried at least 10 times. I purchased as a replacement to a baby monitor and now this one doesn't work either.