How to troubleshoot in Wifi Internet connection?

This is great. I only did the update to fix the SD card on my computer, but now my Wi-Fi isn't connecting.
It shows no internet connection. I already check the settings, and there's a message error showing under Wi-Fi.
Even my network is not showing at all. I have other laptop that I'm using, so I know it’s working. Any ideas?
I've rebooted again and still nothing happens.
