Ae and motorola cable modem

hello all!
i have a comcast motorola SB5120 cable modem, as well as an iBook g4 and a dell inspiron e1405 (xp & sp2)
i bought an ae today so that both computers could connect to the internet, the printer and the stereo (iTunes). the ibook can see the ae but cannot connect to the internet. the dell cannot connect to the ae, so the only way to connect to the internet presently is to plug the ethernet cable from the modem directly into the dell.
anyone have any ideas on how to solve this conundrum?

i let everything sit overnight. the dell can see the ae now and i was able to play iTunes through the stereo, but still no internet connection unless i plug the motorola router directly to the dell.
i called comcast and they said from their end it appears that something is blocking the modem - i assume it's the ae, but i'm not sure why that would be happening. am i supposed to have a secondary router in between the modem and the ae? (that doesn't make sense to me)
and the mac can't even play iTunes through the stereo, but one problem at a time :-/

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sig-
Thanks for your reply to my post. I was able to get back on the internet with the G4 using your suggestion, but the modem continues to freeze, whether connected to the iBook or the G4, using ethernet or airport. I will contact my ISP.

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I found that at least 12" spacing is required between the 802.11n and the modem to avoid any significant interference.
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