My G34 went out on the 4th...I ran every test that Xfinity told me to do...2 technicians came out on two separate times...still no wifi!! Ethernet works... wifi is not! I brought a Xfinity modem to the house...same results!! I even bought a G36 thinking that it was outdated tech!! Still can't get WiFi in my house!!! Something is really wrong here!! Now I'm taking everything back... because I believe my G34 was working just fine!! But something is going on out there with my carrier signal for WiFi on Comcast lines!!

Since you mentioned no Wi-Fi, could you let me know the network name broadcasting in your devices. If not, I suggest you to perform factory reset the modem and let us know whether default credentials broadcasting in your devices.