MacBookPro loses automatic AirPort Connection

My MacBook Pro used to connect automatically to my Airport Express network everytime I opened up or turned on the computer. Recently I accidentally unplugged my Airport Express. Since then, my laptop no longer connects automatically. (In other words, the airport connection on the tool bar is shaded gray...) I have to connect manually from the tool bar every time I open up or turn on my laptop. Can anyone help me figure out what to do with the settings to fix this?
The OS is 10.4.11.

I have exactly the same problem after an ATT line issue which caused my DSL line to go dead. After fixing the line, Airport would not connect to my MacBookPro automatically. So I reset AP Extreme and could then find it but once I put the laptop to sleep or restart it, I have to manually connect to AP Extreme. The G5 tower has no problems and my iPhone is automatically connected

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