I'm sorry about the issue. What did comcast try? What did they say? Were they able to retrieve your Wi-Fi/wireless password ***** not?
What's the exact error or message when connecting the kindle 3 to your Wi-Fi/wireless network name?
What is the brand/model of your Internet/wireless modem/router device?
Do you have a laptop/wireless computer that is currently able to connected via wireless? If so, does it have Windows xp, vista, or 7, 8, or Mac?
Please reply at the box below. Thank you.