Windows 8 wireless network card has been turned on and the wireless light is on but can not find the wireless signal how to do

1. Open the service management interface.
You can open
in three ways. (1) Right click on the desktop computer icon, select “Manage”, click “Services & Applications>, click “Services 
( 2) Press the Windows logo button (the button on the keyboard) and the R button at the same time to open the running interface, enter services, and click OK; as shown below:

(3) simultaneously press CTRL, Shift and ESC Press the button, open the task manager, click on the "Services" tab;

2. Find the WLAN AutoConfig (WlanSvc) service. If it is manual or disabled, right click on this service and select "Enable". The task manager service displays "Start".
If you want this service to run automatically after booting, right-click on the service and select "Properties", select the startup type as "Automatic", then click "Application", click “Enable”, Click the “OK” button to close the settings window. This will restart the computer and the service will run automatically.
The setting steps can be referred to the following figure: