I'm sorry about the issue. Was it working previously? Or is this a new iPad? etc.?
Did comcast try anything?
What is the model of your Motorola modem/router device?
What is the exact error or message when entering the password ***** the iPad?
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, 10, or Mac?
Please reply at the box below. Thank you.