AIRPORT doesn't connect at startup/after sleep

Hi All,
I recently had to reconfigure my Airport Express - that worked fine but now my PowerBook doesn't automatically connect to my selected network, either after sleep or at startup. It connects fine manually, but never automatically.
The connection also doesn't stick when switching between users - it used to.
I saw a post here about deleting the keychain entry - I tried that but it didn't work.
I've tried multiple times to re-add the network into the "join this network" area of network prefs, but it won't connect automatically. Also tried copying & renaming the location but NG.
It worked beautifully before and I keep thinking there must be something I'm missing.
Any ideas?
Thanks in advance.
R.Crooke

Hi R.Crooke, and a warm welcome to the forums!
You've done a ggod amount of the thungs that can work so far, but try this...
Safe Boot from the HD, (holding Shift key down at bootup), it will try to repair your Disk Directory while the spinning radian is happening, so let it go, run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, then move these files to the Desktop...
/Users/YourUserName/Library/Preferences/ByHost/com.apple.networkConnect.<12 digit number>.plist
/Users/YourUserName/Library/Preferences/com.apple.internetconnect.plist
/Library/Preferences/SystemConfiguration/preferences.plist
/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist
These last two will need the originals Trashed since moving them actually just copies them to the desktop.
Reboot. Setup again.

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