Check the following: 1. Do you have power to the modem (power light on)? 2. Is the modem connected to the phone line (RJ11 jack - smaller plug on back)? 3. Is the line working (do you get a dial tone on the line with a standard telephone)? 4. If the modem is good, do you get the DSL light coming on? If not, you need to call Telmex.