Macbook Air failed wifi connection - Does anybody know the solution?

Macbook Air has been connecting to Wi-Fi network without issue for almost 2 years.
Haven't been able to find a solution to 'failed Wi-Fi connection' so far.
Wi-Fi is turned on but is not connected to a network.
Wi-Fi Settings Failed.
Have tried trashing:
Library/Preferences/SystemConfiguration/com.apple.network.eapolclient.configurat ion.plist
Library/Preferences/SystemConfiguration/com.apple.network.identification.plist
Networkintefaces.plist
And restart, but no change.
Mac OS X Version 10.7.5
1.6GHz Intel Core i5
Does anybody know the solution?

Had restarted the router a few times to no avail.
Checked out the vendor's website, but wasn't able to find anything of use, -it was limited options wise.
Nothing in the OS X recommendations for Wi-Fi settings jumped out me.
I wasn't able to experiment with the band/channel settings.
I ended up buying a USB/Ethernet adaptor so I could at least have access to the net (5 days ago), -which didn't change the Wi-Fi issue...
However, after a couple of days without use, I've woken the machine and noticed the Wi-Fi signal at full strength. The network is detected and connected!
Problem solved ...But how?

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