What else is connected to your router?
The only other thing connected to the router is the ethernet that goes into the box that connects to outside.
Do all the other devices (computers, mobile devices, gadgets) work (they can get an IP address)?
Yes.
What make and model router is it? It is a Netgear 750 Wireless Dual Band Gigabit Router WNDR4300
Have you tried using a different Ethernet cable, plugged into a different Ethernet port on the router? No, I will try this.
Do you have any special security settings on your router, such as limiting access to only listed MAC addresses?
In this journey through this mess, I have discovered that my ISP which was SureWest and is now CCI has the router "locked" with its own password that I don't have. Please don't tell me admin and password as I have tried all the passwords known to work and even reset the router to factory default with no luck. I have an email into CCI to give me my router password so that I can get into the Netgear Genie and see what's going on.
Is this a new OBi purchased from an authorized retailer (Amazon, Newegg, or Fry's)? Yes, Amazon
If it's a new unit, then you can try restoring it to factory defaults. I tried this and anytime I dial anything on the phone it tells me, "no service configured error."
Thank you for your time with this. I'm guessing that until I can get into my router, there's not much else to do?