AirPort utility suddenly not connecting to network properly

It's really frustrating, because I've tried a number of things and I still can't get it to work. Basically, I had wireless internet connection working just fine, the router (Linksys, if it matters) just a few rooms down like it always is. I left my MacBook Pro on for a while and when I checked back on it a few hours later, the internet was no longer available.
Every other computer in my house is connected to the network fine, so I know it's not the router or my internet connection. Every time I select my network using the AirPort utility drop-down menu at the top right of my screen, it prompts for my network key, but every time I click on connect it just says "connection failed", and when I open up the actual Utility it just prompts me to rescan a bunch of times, stating that no apple devices were found.
It doesn't make any sense to me, expecially sionce I've had absolutely no problems for the almost two years I've owned my MBP. I've tried restarting my computer and my router but to no avail. It just suddenly stopped working last night and I'd really like to get it working again, any help I can get here would be deeply appreciated!

That has happened to me before. I think there is an airport utility that has been released recently, install that and see if it works.
Airport is weird. Try to connect your laptop and hardwire it to the router. Shutdown your MBP, turn on, and see if you get a signal.
Uninstall airport and re-install and see if you can aquire a signal. If not, there is a possibility that something with your router failed.

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