OK, fan is on a temp sensor. It's running now.
I managed to get it to work (temporarily) by:
1) Rebooting the router.
2) While holding in the red button on the back and powering up the NAS
3) In about a minute, it was recognized by the router (Device Name: LINKSTATION) and the share was available across the network.
I pulled ALL the files off the NAS and onto my server's RAID array so everything on the NAS is now backed up.
Tried to run Buffalo NAS Navigator - Couldn't find the NAS device.
Tried to run LSUpdater - Couldn't find the NAS device.
Shares still available across the network.
Turned off LinkStation and back on... Back to square 1 with 4 LED flash code.
Where do I go from here???