Need more info. Does the unit go into search mode? "SPOT & CLEAN" flashing? It actually tries to search? Do you have another roomba to test your dock on to see if IT will dock? If it tries but just cant, then either the dock transmitter, or the roombas receiver is dead. (The round antennae thingys on the dock and the bumper) replace these would be the first point.
Answers & Comments
Need more info.
Does the unit go into search mode? "SPOT & CLEAN" flashing? It actually tries to search?
Do you have another roomba to test your dock on to see if IT will dock? If it tries but just cant, then either the dock transmitter, or the roombas receiver is dead. (The round antennae thingys on the dock and the bumper) replace these would be the first point.