Thanks for your reply. Phone lines blinking since lightening strike, through multiple power off and restart efforts.
As I said, yesterday I tried to factory reset the router, thinking I could get things sorted by starting from scratch. However, when I powered it back up, both phone lights are still blinking, and when I plug a phone directly into the Obi, there is no dial tone, and I can't connect to anything.
Sounds like I need a new one. Good to know I don't need a landline to set it up!