With new ADSL connection, my laptop been shutdown please, help…..

Usually i use a broadband dongle for connect to the internet. but yesterday i have used a cable type ADSL connection to it. but when i connected the cable to my laptop, laptop has been shutdown automatically. after that i have checked my new USB modem, and laptop battery also laptop power adapter there is no problem. what is reason for this if any one know.
Please help me. thanks.
