That's good news as at least the radio chip is working. If you have access to the neighbours one or another that you are authorised to connect to, try to comnect to that, even if it's in a cafe wifi. That would point to a problem with your router. The message suggests you are on N with a deprecated encryption. It should be WPA2 (AES) for most routers.
But if that fails the only alternative is to reload the OS from Desktop Software using de-brick. You will lose any data not backed up.
Debrick:
Make sure you know your Blackberry ID and password
If you can, backup important data. (Preferably by file share drag n drop.)
Turn Playbook right off (i.e. Shut Down)
Ensure you have the latest Blackberry Desktop Software to your PC or Mac and start it up
Connect the Playbook by USB cable.
If the red light starts to glow press the Off button.
Because Playbook is off you will get an error message basically saying Retry or Update (on Mac it says repair rather than Update)
Quickly select the Update (or repair) option
The Playbook will start to get a new OS that will take a good hour to download via the PC
Follow the registration process using your current Blackberry ID
Add back your email accounts etc.
Reinstall your apps from App World, My World.
Copy back your data.
