Upon restart, doesn't automatically connect to wi-fi

Since upgrading to 10.7, every time I restart my iMac (Intel, 3.06 GHz, 12 GB RAM, late October 2009 model) it doesn't automatically connect to my home's wi-fi. I have to go into the wi-fi menu in the menubar and select my network.
Anybody else having this problem? Any solutions?
I'm running 10.7.1 with the latest security update.
Thanks,
doug

Doug:
A little more info, please...
In System Preferences, Network, Wifi, Advanced - what do you have there?
charlie

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