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You need to reset the modem without any devices attached to it except the router. Then see if you get an ip (connect to the router using the 192.x.x.x address on your computer). See with the ip address is on the router. Hopefully your router and your cable modem are not trying to use the same subnet. Also look at what the router gets for dns servers. Any easy test to see if the problem is dns is to trying pinging a website directly by the domain address. If it works using the ip and not the name then it is usually an easy fix.
My guess is that it is not the dns and is more likely dhcp.
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