Mac Pro was fine but now it has no Wi-Fi configured?

I Must have accidentally turned my Wi-Fi card off the symbol for it at the top of the display is gray and has an x in the middle. How do I turn it back on?

Go to System Report and see if the wifi hardware is listed under the Hardware section
Try resetting the SMC and PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM
Try reseating the wifi card

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