Mini GIBIC Problem

Right now we are using 3 of these switches in our network to connect 3 different buildings to each other. There is fiber run between the three building. Now here is where the problem starts. We have a connection between building 1 and 2 but from building 2 to 3 there is no connection. The port is lit in building 3 saying there is a connection but in building 2 the port is off. Now if I haven't lost you yet. Both the ports are configured the same and they are on the same VLAN. They are both set to the same speed everything should be working but it doesn't. If anyone has any suggestions that I should try let me know thanks for your time in helping me solve my problem.
Andrew