Do the following procedures to isolate a port replicator problem.
A port replicator attaches to the system expansion connector
at the rear of the computer:
Turn off the computer.
Remove the failing devices from the replicator.
Unplug the AC adapter from the replicator, if attached.
Remove the port replicator from the computer.
Reconnect the failing device directly to the computer.
(If another device occupies the connector, remove it first.)