I have 3 Cisco 3512's going into a 3508 in one building. On all 3 switches I have Dell GX270 PC's with Intel Gig/100 NIC's. On one switch, which I also have a Xerox Phaser 8400 printer attached I am getting a whole lot of errors. My users when logging onto the computers in the "bad" switch sometimes cannot log onto the domain or don't get all their drive mappings. The printer sometimes doesn't print and also spits out connection errors. Looking on this one switch I am getting errors on all my interfaces, many input and CRC errors along with overruns and ignored. The errors I am getting are just on the fastethernet ports, not the gig "uplink" interface. Is there anyway I can resolve this, is this a Cisco code problem? Is the switch bad? The switch is running version 12 of the IOS which I believe is the latest. Any help would be greatly appreciated.