Wi Fi disappeared from my network services. Now, Wi Fi unavailable on my Mac.

I am using a Mac Pro (early 2009 Model) OS X 10.10.2, 2.93 GHz, 8GB memory.
About a week ago, my Wi Fi suddenly disappeared from my Network Services. I cannot access any Wi Fi network because the Icon or a Wi Fi link does not show up anywhere. I tried the diagnostic test but that did not work. I re-booted my computer, I re-installed Yosemite and did a software update and my Wi Fi still did not show up in the network services.
Any help in reconnecting my Wi Fi services will be greatly appreciated.
Skel.

Open the Network pane in System Preferences. A list of available network services appears on the left. If Wi-Fi is in the list, select it, then from the popup menu labeled with a gear icon at the bottom of the list, select
          Make Service Active
Click Apply.
If Wi-Fi is not in the service list, click the plus-sign button at the bottom of the list, and then select Wi-Fi from the Interface menu in the sheet that drops down. Click Create, then Apply.
If there is a closed padlock icon in the lower left corner of the preference pane, click it and enter your administrator password to unlock the settings.
If the above steps don't solve the problem, continue.
Triple-click anywhere in the line below on this page to select it:
/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist
Right-click or control-click the line and select
         Services ▹ Reveal in Finder (or just Reveal)
from the contextual menu.* A folder should open with "com.apple.airport.preferences.plist" selected. Move the selected item to the Trash. You may be prompted for your administrator password. Restart the computer and recreate your settings for Wi-Fi in the Network preference pane.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination command-C. In the Finder, select
          Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return.

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Wi Fi disappeared from my network services. Now, Wi Fi unavailable on my Mac.

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