To JEB1,
Are you using the original power supply that came in the box?
Try another 12V power adapter, connect to the OBi. Try the power adapter for your home router, usually it is compatible. And see if the OBi device power LED can light up and change from blinking RED to GREEN, and after a minute later, check for dial tone. And see if you can press ***, you should be able to hear voice menu.