amigadave,
Have u set the "no df1" motherboard jumper so that df1: is active?
Usually when the drive lights on all the time,its a sign the cable is on the drive backward,you may check for that.
pin 1 on the drive is away from the power connector.
red stripe on cable should also be away from the power connector side.
last,you might check and make sure someone hasn't put a pc floppy cable in the 3000,which has a different twist than the amiga cable. this all assumes you are using amiga floppy drives of course.
hope that helps,
Mike