I have Subject switch, and one of the led lights, port 1, is blinking
off and on. The connection to port 1 cannot be seen from the other two
PCs on my LAN. The other two PCs can see each other. Up until recently
this 3 PC LAN was working fine.

I've reset the switch several times, and nothing changes. I rebooted the
PC on switch 1 and it hasn't changed the behavior. Checked the
connections and they seem solid. Switching the PC port to another port
produces the same blinking. Comments?