Connection Problems D-link DWL-2100AP , I see

Disconnect the router and turn it off then press and hold the RESET button on the back of the router for 30 seconds.

Next, connect the power adaptor from the router to a fully functional wall outlet and connect the Internet cable to the Internet or WAN port on the router.

Then, open Internet Explorer and type 192.168.0.1 in the address bar and press Enter to check if the router is accessible.