Modem doesn't recognize Mac

On a cold start, my modem doesn't recognize the Imac. I have to restart the modem to connect the computer to it. All connections are correct and tight. Ethernet to Ethernet. Absolutely no changes other than down loading Mavericks. Apple suggests  taking Imac into store and replacing mother board. Everything worked perfect until new download. The modem does recognize the ethernet connection after sleep, but not after a restart. Anyone else having similar problem.

Linc, thank you for your reply.  The only things listed on the drop down menu are Bluetooth PAN, Firewire, Ethernet 2, Ethernet 1, Bluetooth DUN, VPN, PPPoE, and 6 to 4.  Wifi doesn't exist on the list.  I believe my problem might be that because the light on the Xfinity modem for wifi is not lit, it is not communicating with my Mac Pro.  Although the folks at Xfinity are showing that my wifi is active, it doesn't seem to want to behave.  I don't even know how to activate the wifi on my Mac.  Everyone keeps telling me to click on the little icon at the top of the desktop.  I don't have one of those icons there.

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