The reason for a yellow exclamation mark on the laptop WiFi signal

　　Specific methods:

The first step, the computer can also be networked, indicating that the wireless network before the connection, not in accordance with the normal way offline. Try restarting the computer.

The second step, can not be networked, indicating that the wifi signal has been searched, but no connection, first check the wireless router and the cat's connection is loose.

The third step, the router and the cat is no problem, the wireless network will be deleted all, let the computer search the wireless signal to try again.

The fourth step, can not be resolved, it is estimated that the network card driver failure, you can go to the official website download wireless network card driver, reinstall.