Netgear Router RP614 Issue....

Hello,

I am having an internet connectivity issue. A few days ago bought a Netgear RP614 router. My computer is a Hewlett-Packard Compaq. Router came with no instructions, but, I simply connected it up with my computer and it worked fine for 3-4 days. Yesterday it literally would not work - if I connect to it I get no internet, no nothing. I get my internet through Cox through a cable modem. I sense this is a configuration issue of some sort, if the modem was defective why would it ever connected at all?

Any help would be appreciated!