Automatically find home wi-fi at login

Question

"Somehow" for the past week my Network System Preferences aren't automatically finding my home w-fi so I have to do it manually each time that I start up.
I tried to figure out which setting needs to be changed or changed back to how it was. I have my home network at the top of my preferred networks.
The first Preference Screen in Network has a drop-down to choose "Automatic" which is selected; under the Options, there is another drop down to choose either "Preferred networks" or "Automatic" changing this back and forth doesn't change the situation - still have to manually start the home network.
I tried looking at the network preferences in my other Mac (10.5) but the format and options are different so I may not have tried all of the possibilities.
Suggestions? Thanks

Answer 1

Hi Rick,
Go to System Preferences
Click Network
Highlight AirPort and click Configure...
Choose “By default, join: Preferred networks”
Select your access point and Remove your access point with the minus button.
Launch your keychain access in Utilities and delete your access point keychain entry.
Reboot
Go back to the “By default, join:” page and click the plus this time to add your access point. Enter the correct password, save, reboot.