[xubuntu] HP laptop can connect to network but not internet

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http://ubuntuforums.org – I am a relatively new Xubuntu 11.10 user. I have an HP Pavilion dv6 (dv6z-6c00). I had no trouble connecting to WiFi network or internet until I moved 2 days ago and Comcast provided a new modem (Arris TG862). Trying to connect to the internet via Linksys WRT120N router. I had issues connecting but thought it was because it was a new house and signal was weak in my bedroom. I have had no trouble connecting to the LAN/WAN but have had very poor connectivity to the internet. Typically it would connect for about 1-2 minutes and then drop. Tonight (about 48 hours later) I have had 0 internet con (Hardware)