[Sierra]

OK I am sort of savy but I need some help. I cannot connect to the internet via my router. I plugged my cable modem directly back into the computer and I am connected now. I have checked and through ip config that I have an IP address. This all started when both my router and modem stopped working. I could not connect to the internet with the modem directly plugged in. I called the cable co and they walked me through some steps and voila I have internet but they cant/wont help me with the router. I called Linksys and they say since its out of warranty it will cost you x amount of dollars for us to help. I did some research and the problem sounds simple but I cant find a defintive way to fix it. So I am turning to you my Camaro 5 friends. The model number is wrt310n . Any hep would be appreciated.