Ethernet Connection to iMac does not work if wireless is on!

I have a Linksys modem ethernet router which I use to connect an ethernet cable to a hub which is then connected to my iMac and my Xbox. (It is also connected to my Windows PC via USB) When I connect my xbox wirelessly with 2 wireless access points Xbox live works fine wirelessly but the ethernet connection to the iMac stops working. Does the wireless signal interfere with the ethernet connection? and is there any way to fix this?
iMax G3 Mac OS X (10.4.5)

Are you certain that you have a router?
The wireless connection should have no effect on your Ethernet connection.

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