Do you have any other issues with wireless devices seeing the modem?
So just to clarify, you've also tried a manual wireless setup and it can't detecft the nwtwork, or have you just tried pairing with the pair button? When you press the pair button, does the pair light come on?
Try also going to http://10.0.0.138/> WiFi, and click on the WPS Start button and see if that gets anything going