How can this be...No signal?

Okay I have my iMac with a strong signal from my Airport Express which is located within 5 feet of my computer desk. My Macbook Pro is sitting right here and today I have no WiFi signal coming to it. When I try to go online using the MBP, its saying I am not connected to the internet! I am able to post this question to this forum because I DO have a WiFi signal on my iMac!
How can that be that I have a signal on one and not the other? Yes I get online with the MBP all the time and today its not acting right. I am sure if I reboot my laptop that might solve the issue but in case it doesn't, this is a strange thing to happen!

I would start by simply turning off, and then, turning on the built-in AirPort on your MBP. You can do this from the AirPort icon on the OS X menu bar.

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