Airport Network not reconnecting automatically at computer start

Hi everybody,
Just purchased a new Airport Express because the old one was failing often.
At each start of the computer, I find a window : "None of your preferred network is available " with the list of all WiFi networks in the neighborhood.
Mine is listed as well, so I have to select it and click " JOIN" .
The previous Airport Express was not doing this. Did I miss a setting ?
Thank you in advance
Alain

Please try the following:
1. Delete Preferred Network(s)
o System Preferences > Network > AirPort > Advanced > AirPort tab
o Under "Preferred Networks," delete the network(s) you regularly use from the list.
2. Delete AirPort Keychain Entries
o Launch the "Keychain Access" application located in Applications/Utilties.
o Click on the "Kind" filter at the top, and look for any "AirPort network password" entries...and delete them.
o Restart, or log out then back in.
3. Add Preferred Network(s)
o System Preferences > Network > AirPort > Advanced > AirPort tab
o Add the preferred network(s) using the "+" button.
o Restart or log out then back in.

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Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
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Welcome to the Support Communities!
The article below may be able to help you with this issue.
Click on the link to see more details and screenshots.
Resetting an AirPort Base Station or AirPort Time Capsule FAQ
http://support.apple.com/kb/ht3728
iOS and OS X: Recommended settings for Wi-Fi routers and access points
http://support.apple.com/kb/HT4199
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Airport Network not reconnecting automatically at computer start

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