I did open a ticket and after much back and forth was told that my Obi had electrical problems and I should just buy a new one...
What really irritates me is that I left it plugged in all last week on business travel (mostly by accident - I had reverted all my phone lines back to my old PAP2T and just didn't power the Obi off.)
On a whim, I tried accessing the Obi by plugging in a dumb unpowered phone this morning - low and behold a dial tone. And when I added the Obi back via ObiTalk - it responded, accepted my touch tones etc.
AND - it has the latest firmware (4420) which I was told EXPLICITLY by an Obi Tech had nothing to do with my problem.
Don't know if they used a back door to get in (it was working at least to retrieve an IP address) - or if sitting unmolested but powered on for a week magically cured it - either way it is working.
Thankfully I DIDN'T buy another box (was thinking hard about whether I wanted to do that - my father's Obi ALSO bit the dust some months ago but was still under warranty and I got a new one for him.)
If you think you are bricked, my advice would be to power off, do a hard reset per Obi, power on and just let it sit for a good long time. (Oh and open a ticket and maybe the Obi fairies will sneak in and fix it for you!