I have a powerconnect 2016 with 4 pc's, a firebox SOHO linking to speedstream dsl modem, and one printer. Everything is working fine for a year.  This morning, nobody has access to the internet.  After much messing around, the only way to get it to work is to disconnect the firebox and plug the modem directly into the switch.  However, only one pc can access it and now a differnt pc only has the Lnk light on.  I changed cables, but can't get the other 2 lights to work.  Any help is appreciated.