No internet when using router

I received a RCA modem, model: DHG535-2 from comcast for internet and phone. I have a NetgearWGR614 v.6. My modem is connected to the internet via cable. The USB has never been used on my modem. When the modem is connected to my computer via ethernet using CAT5 I get great internet at 100Mbps. When I try to use my router I continually get told that I have no connection. I have reinstalled my Netgear software and set up the hardware as they directed (again!) There is no on/off button on the modem. It has to be unplugged. I even took the battery out! Does this router not work w/this modem? I've never had problems w/this router before. I have even used comcast service in the past, but it was a different brand of modem I was given-it worked then fine.