Connected my new macbook to my network at work via ethernet cable. It would always tell me that there was no internet connection, but I would just open Safari and it would find the connection and everything worked fine. Our cable company came in and switched out our old "static" modem to a "dynamic" one and now I am unable to connect. We connect through a Cisco ASA 5505 router to the new modem. Any ideas would be GREATLY appreciated.