need help i have a sb5101 w/haxoware 39 just purchased and i cant get online

[okojo]

ok plugged up modem changed my dns setting using several of the known dns setting out there... all of my light are synced but i still cant get online when i chose auto... dns i get the comcast page when i put in the dns settings ie...4.2.2.2 i get nothing i feel like i missed a step was there something else i was suppose to do when i got this modem please help i saw a few tutorial about logging in the modem but i didnt see where i needed to change anything or upload a file of some type... Is this what im missing am i suippose to upload something or change a setting? im on comcast in wash dc

[drewmerc]

log into the modem and check that the frequency is correct
also check you enter a valid mac address
and that your using the right config
make sure your spoof strings are the latest

[okojo]

log into the modem and check that the frequency is correct
also check you enter a valid mac address
and that your using the right config
make sure your spoof strings are the latest

how do i tell if i have a valid mac adress and how do i check do i check to see if im using the right config i never did any cofig or upladed anything was i suppose to

[drewmerc]

if it's your first time copy the mac from your subbed modem (and frequency)

[tauro91]

Check your logs. There are most of your answers =)
p.s: Since Comcast launched Docsis 3.0 i would recommend you to check if your area has it and if it does actually pay for it Its worth it, and make sure to have the right modem .!