Don’t panic, but you do have a problem. You look under Services and the Cluster service is running on the nodes. Open Cluster Administrator from one of the nodes, but don’t use the name of the cluster, the node name or an IP address, use a period (.). This will open it using a Local Procedure Call (LPC) and not a Remote Procedure Call (RPC). See Cluster Administrator Switches for Connecting to a Cluster for complete switch details.
Now with Cluster Administrator open, expand the Cluster group and attempt to start any failed resources. Whatever keeps failing should give a clue as to what is broken, disk, IP, network name, etc.