My Obihai/GV is down this morning. GV tested OK, and I recycled my OBi100, but my Obihai/GV system is still down.
Confirm that you have rebooted modem, separate router (if any) and OBi, in that order.
Does the OBi echo test work? Can you log into your OBi? If so, what does System Status show for the various services?