Indoor Cam won't enter setup mode

Hi there, I recently purchased two indoor cams. One of them set up with no problems. The other one is being difficult. It will not enter the set up mode. The blue light will come on with a single flash sporadically, but it doesn't get to blinking. I have tried pushing the setup button on top of the camera. I have also tried the following to reset. Unplug the camera for 1-2 minutes. Power on, wait 1 minute, hold down the setup button for 30 seconds, wait a couple of minutes, press setup button again... still nothing. Anything else I can try?