There may be a tiny switch on the side of the laptop (on in the front) that turns the wireless ON/OFF. Make sure you’ve switched it on.
You may also need to toggle the laptop WiFi by pressing and holding the Function key and pressing F2.
Let's run the network troubleshooter and see if it can detect and fix the problem.
Open the Network troubleshooter by right-clicking the network icon in the notification area, and then clicking Troubleshoot problems.
Refer the 'Microsoft Help' and 'How-to article' for more information: