In my MODEM the DATA light isnt working and th internet stops to work! what to do?

-please tell me steps to clear this problemIs this cable or DSL? If it's DSL, it's because something is connected to your phone line without a proper DSL filter. It's easy to miss an alarm system, satellite TV receiver, answering machine, or cordless phone base station. Every device connected to your phone line must have a DSL filter.