The first thing is that Comcast is Not a DSL connection it is Cable connection. Now first make sure that your computer will be able to go on line when connected directly to the modem. Connect your main computer directly to the comcast modem and check if that goes on line. If not then you will need to contact Comcast and get main computer on line. If it is online then reset your router for 30 seconds. release the reset and wait for 1 minute. Now connect the main computer to the router and comcast modem to the router. open the set up page and Clone the MAC address of the " Main " computer.
power cycle the modem and the router. See if it works.
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