A word of caution. If you think you have a blown fuse, don't connect the SSC to another cat5 connector on the hub. If so, you are likely to blow anther fuse.
If you have a working SSC, connect it to the hub and retest. If it works, then you know the fuse is fine. You can also use an Ohm meter across the green fuse to test.
Are you saying the 4th SSC was working before you tried to program it?