Thanks Bush- Shadow_BshwackrHi Rudder!
I suspect your New Cable Modem and Router are not working with each other. Did you open/forward the ports you need on both? Click HERE for more info on your modem. There's a link towards the bottom for a user manual as well as a couple other useful links.
Also, when you use a combination of Router/Modem and another router, one has to be set up as a Bridge router. If you don't need to use both, I would suggest ditching one. If you need more ways to connect other computers, try using a switch or hub instead.
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