Description: We have a 7761CM that will not work unless you power the unit with the cable power and the 12 volt dc .
1 . With the cable ac / signal hooked up , the modem is working but unit Wi-Fi will not work, and you cannot see unit on network .
2. With the cable ac / signal hooked and 12 volt dc hooked ,WI-FI works and you can see unit on network
Any suggestions ?