Macbook Pro - "Invalid Password" problem with home Wifi

Hi folks,
As of 5 days ago...my MBP refuses to connect to my wifi at home. It constantly returns a "invalid password" response.
It has been connecting to this same wifi network for years, and nothing has been updated or changed on the network settings.
My iPhone and non-Mac computer can connect without trouble.
The MBP can connect to OTHER wifi networks, no problem.
As per here: Wi-Fi: How to troubleshoot Wi-Fi connectivity - Apple Support
I deleted all existing networks and re-started, but issue remains. This wifi uses a WPA2 password.
Something must be corrupted / broken on my MBP...but I can't seem to "start from scratch" to get my wifi working again. Extremely furstrating. Liek I said, my other devices can connect wirelessly without issues.

    Power off the router. Unplug it from the wall. Wait a while.
    Plug it back to the wall. Power the router on. Wait until all the lights are lit properly. It will take a while.
    Restart the computer.
    Start up in Safe Mode.
    http://support.apple.com/kb/PH14204

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Hey Brittany,
Welcome to Apple Support Communities.
It sounds like you’ve done quite a bit of troubleshooting to try and resolve the issue with your MacBook Pro not connecting to your Wi-Fi network. If you haven’t already, take a look at the article linked below which provides some additional troubleshooting suggestions that may help you resolve the issue.
Wi-Fi: How to troubleshoot Wi-Fi connectivity - Apple Support
So long,
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Macbook Pro - "Invalid Password" problem with home Wifi

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