Solve Win7 notebook can connect to wifi but has a yellow exclamation mark

Specific solutions:
1, if the computer can also be networked, it means that the previous wireless network may not be offline in the normal way, try to restart the computer;
2, the exclamation point means that even the Internet is not connected. Even if we don't connect to the Internet, we must first consider whether there is a problem with the router's network cable connection. It may be that the network cable is not plugged in, the network cable is loose, or the network cable plug is broken. Specifically, check it;
3, restart and start the router. Some routers may cause excessive temperature due to long use time, and some functions are abnormal. Therefore, you only need to restart the router at this time. After turning off, let the router rest for a few minutes and then restart.
4. Check it. The number of connections to the router, sometimes the number of router connections is limited, or the design of the router itself limits the connection to only 3 or 4 users. In this case, if the number of connections reaches the limit, even if the connection is up, I can't even connect to the network;
5, there is a problem with the router hardware. In this case, it may be routing. The hardware is broken, so it is recommended to replace the router device;
6, if the router and the cat are ok, then delete the wireless network first, let the computer search for wireless signals again;
7. If it still can't be solved, it may be that the NIC driver has failed. You can go to the official website to download the wireless network card driver and re-install it.