My mac won't recognize ANY wifi networks.

All of the sudden, my airport utility on my Macbook Pro won't detect any wifi networks. My other devices recognize my network, as well as about 12 others around me, but my laptop, which never had a problem before, won't find any. My computer crashes at least once daily (it's old at this point), and it did today, not unusual, and now my airport can't find any networks. Help? I'm running Yosemite.

You have a Yosemite issue, so your best bet for a timely and informed response would be to post in the Yosemite support forum. The link is just below:
OS X Yosemite
Alternately, but probably not quite as appropriate, you could try a post in the MacBook Pro support forum as well:
MacBook Pro
We handle questions about the Apple wireless routers....the AirPort Express, AirPort Extreme or Time Capsule....the products pictured below. If you have a question about one of those products....we can likely help.

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Hi
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Hello Nancy,
Thank you for the details of the issue you are experiencing with Wi-Fi on your iPhone. I recommend the following article and specifically steps 4 and 6 for the situation you described. Step 4 says to restart your phone, but if you click on the link in step 4, you will get the steps to reset your iPhone as well.
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/ts1398
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theevilone,
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My mac won't recognize ANY wifi networks.

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