If you mean the yellow exclamation mark appears on the computer broadband network connection icon, it is usually caused by ip address conflict. It is suggested that you can open the network * * * Enjoy Center, choose to change the adapter settings, right-click the local connection properties, double-click ipv4, choose to automatically obtain ip, and then start running, enter CMD, enter ipconfig \new at the command line, and try to obtain the IP address again.