Not auto-connecting on restart or after sleep - help

I have an Apple Airport Extreme router configured with 128 WEB.
When I start up my MacBook I have to go up to the Airport status and select the network. Since I have already entered and saved the password, it connects and then all is fine - until it sleeps or I shut it down. Then I have to go back up to the status icon and reselect. There are no other wireless networks detectable.
Now what is weird is that I have an intel iMac and it always connects. When I go to the sys prefs > Network on my iMac it says by default join Automatic. But on the sys prefs > Network on my MacBook it only gives me the option of joining a specific network. I tell it to automatically join that network but it doesn't do it!
Both OSs are up to date.
Any thoughts?

That happened to me on both my macbooks i just found a fix go to your network settings and have it only connect to prefered networks then ad your netowork 5 times this causes the computer to keep rescaninggng

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Not auto-connecting on restart or after sleep - help

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