Can't see shares / network
We have a windows 7 network with homesharing turned on. All computers on the network are supported by individual UPSs. On Friday there was a thunderstorm resulting in an extended power outage that lasted several hours. The UPSs shut down all of the workstations as we had planned. All our data files are stored on one central computer to facilitate ease of backup; we call that workstation, the "server".
On Monday, the "server" indicated it was not connected to the internet; none of the built-in troubleshooting tools were successful in resolving the connectivity problem. All of the other workstations could access the internet and see each other, but not the "server". The last error message of the day suggested the "server" connection to the modem was faulty.
Tuesday, I installed a new NIC and disabled the built-in ethernet connection. This changed nothing. I changed the ethernet cables. Still no internet connection, but the "server" is now visible (it can see and be seen by) to two of the other workstations; oddly the two workstations that can see and be seen are used by two individuals who have little use for the server other than the occasional file.
How do I restore accessibility on the "server" so that all workstations can see it and their files.