Lose wifi connection with airport express

Everytime I turn on the computer, there is no wifi connection.  The symbol is still at the top of the screen, but is gray rather than black.  I can click on it and it gives me the choice of my network or a neighbor's.  All I have to do is click on mine and it connects.  This is a real pain.  Anything I can do

In System Preferences > Network and create a new network location.
Test by restarting the iMac.
In System Preferences > Network > Wifi > Advanced remove your network from preferred networks.
Open Keychain Access under System remove your network.
Copy /Library/Preferences/SystemConfiguration folder to your desktop as a backup. Then trash the main SystemConfiguration folder and restart the mac.
The above steps basically make the iMac's network settings default.
Join your network and remember in keychain, if prompted.
Do a restart and hopefully the iMac will automatically join your network.

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