Cannot connect anymore to WPA2 Personal after upgrade

Hi everybody,
I'm writing because I cannot access anymore my Wi-Fi WPA2 Personal after I upgraded successfully this morning my Macbook, I bought it at the end of 2008.
The wireless icon on top right shows me the ! (exclamation mark), the IP address is assigned correctly. I tried deleting the network from the preferred connections but it didn't work.
I add the fact wireles connection worked perfectly since today.
Can you help me? Is this a known issue of OS X Maverick?
Thanks in advance!

I post the workaround that solved my problem, thanks again to wifiguru!!
wifiguru wrote:
Backup these 2 files:
/Library/Preferences/SystemConfiguration/NetworkInterfaces.plist
/Library/Preferences/SystemConfiguration/preferences.plist
Then delete these 2 files and reboot. If you upload these 2 files someplace I can take a look if something was wrong in there.
Practically, I made a backup of those files, deleted them with root priviligies and reboot the computer...after that, I found with no work the Wi-Fi connected to my wireless; everything worked fine.
Hope this post helps people with same problem..

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    Last edited by Shocker (2015-05-07 19:18:43)

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