OS 10.8.5 Wi-Fi doesn't find "Preferred Network"

We installed a new modem provided by Comcast that has built in wireless. After naming and establishing the password for the network, I successfully connected via my MacBook Pro, which detected it. Once connected I accessed the "Advanced Settings" screen in the Network control panel.
Under the first "Wi-Fi" tab I dragged the new network to the top of the list of "Preferred Networks." I also confirmed that the "Remember networks this computer has joined" check-box was selected.
Yet each time the computer wakes from sleep or is restarted the Wi-Fi utility scans for networks and doesn't connect to any. When I click on the control bar icon for Wi-Fi the network appears -- usually at the bottom of the list -- and when I click on it the computer connects immediately.
Obviously this defeats the point of remembering preferred networks and is a nagging time-suck at the start of each work session. Has anyone else experienced this problem and discovered a solution?
Thanks!!
Joseph
Washington, DC

Hello Joseph_DC
If you are having issues with it not connecting after waking from sleep, the check out the article below to troubleshoot the issue further. Check in the section Symptom: The network connection drops unexpectedly and there will be a solution just for that issue and will continue with going into Keychain Access the
iPhone: Troubleshooting No Service
http://support.apple.com/kb/ts4429
Regards,
-Norm G.

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OS 10.8.5 Wi-Fi doesn't find "Preferred Network"

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