Ensure your phone or Ethernet cable is securely plugged in. Next, make sure there is power going to your modem. If you have an ADSL modem, is the ADSL light on the modem solid green? To check if you have an IP address, do the following:
For Windows98 or earlier, go to the Start menu, Run, type “command”. At the prompt, type “winipcfg”. A window pops up. Use the drop-down box to select your NIC card and hit the “Release” button, then hit the “Renew” button. If you do not get an IP address, call the Helpdesk.
For WindowsNT or later, go to the Start menu, Run, type “cmd”. At the prompt, type “ipconfig /release” and then type “ipconfig /renew”. If you do not get an IP address, call the Helpdesk.