Final answer:
In a Broadcast OSPF network, if all routers are in the 2-Way state and none is a DR or BDR, check that all have their priority set to 0, disqualifying them from the election.
Step-by-step explanation:
On a Broadcast OSPF network, when all routers are in the 2-Way state, and none is selected as the Designated Router (DR) or Backup Designated Router (BDR), you should check that all routers on the segment have the same priority set. The priority is a value used to elect the DR and BDR in OSPF. If all routers have their priority set to 0, it means that they are all configured not to participate in the DR/BDR election, as a router with a priority of 0 is ineligible to become the DR or BDR.