The laptop can't connect to wifi. What happened?

1. The power supply system is the most suspicious fault of the router, so the first thing to check is the power supply system to see if there is current and voltage in the power socket. If the power supply is normal, check whether the power cord is damaged or loose. If the power cord is damaged, replace it and plug it in again. 2. Wireless router settings. The wireless router can only connect 16 wireless devices at most, and if there are more, it will not be connected. Some people can connect to WIFI, while others can't. If someone disconnects the connected WIFI, the people who can't connect can connect, and the number is equal. I checked in the routing management panel and found that 16 was connected to WIFI, so I can't connect it anymore. 3. The problem of exceeding the signal range is usually because the set refresh frequency is beyond the frequency range of the display. Beyond the signal coverage, it is directly the distance. Generally, when the router exceeds 10 meter, the signal will deteriorate. So when connecting wifi, try to get close to the signal source and enhance the wifi signal. 4. Set the protection m address. It is recommended to confirm whether the router has turned on the MAC address filtering function (black and white list), and restart the router after resetting. The setting path of router Mac address filtering is generally: router management interface-wireless settings -MAC address filtering. Add your mobile phone MAC address to the allowed MAC address access list or delete it from the forbidden MAC address access list. Different routers may have different setup paths, but the names of setup items are roughly the same. If not, please refer to the router manual or consult the customer service of the equipment provider.