go to network places and check if the wireless connection has been enabled if else enabled it and just obtain the ip automatically enable to connect to the internet
If you have an old connection, go to wireless connection and either manually edit or delete the connectoid for your home wireless network. Then try to rediscover. There is a bug where the connection can be changed from automatically connect to manually connect which can cause you some issues. Also, if you have disabled the SSID broadcast in the wireless router, that can cause you issues. It is recommendeed that you use encription (WPA or WPA2 (prefered)) to protect your wireless connection and leave the SSID broadcast enabled.