1. Check whether Wi-Fi is turned on and reconnect to the network. 2. Make sure the flight mode is turned off and the time is set correctly. 3. Delete and re-add the Wi-Fi service through "Network Preferences", or refresh the DNS cache using terminal commands. 4. Try restarting your router and Mac. 5. Update the system software and confirm the model support status. 6. Troubleshoot hardware problems, such as signal strength, network replacement test, or using USB wireless network card. Operations one by one for the above steps can usually solve the problem of Wi-Fi connection on your Mac.

Wi-Fi not working on Mac is a common problem and can be caused by system settings, hardware status, or router connections. The key is to first determine whether it is a common problem or specific to your device, and then gradually investigate.

Check basic settings and status

First, confirm whether Wi-Fi is on and try to reconnect to the network. Click the Wi-Fi icon in the upper right corner of the screen to see if "Wi-Fi is on" is checked, and then select your network from the list to try to connect.

If the network is in the list but cannot be connected, it may be a password error or configuration problem. You can try "Ignore this network" and reconnect and enter the correct password.

Some small details to note:

• Make sure the flight mode is not turned on
• Sometimes, even if you show that you are connected, you may not actually get the IP address
• Incorrect time settings can sometimes affect the authentication process

Reset network settings and services

If the basic operation is invalid, you can try to fix it with "Net Preferences":

1. Open System Settings → Network
2. Find the currently used Wi-Fi connection in the service list on the left
3. Click the "-" sign to delete the service, and then click the "" sign to add it again
4. Save and try reconnecting

You can also try the terminal command to refresh the DNS cache:

 sudo killall -HUP mDNSResponder

In addition, some users find that the problem is automatically solved after restarting the router and Mac. Although it sounds simple, it can indeed handle many temporary failures.

Check for drivers and system updates

Sometimes the problem is that the system version is too old or the wireless network card driver is abnormal. Go to System Settings → General → Software Updates to make sure your macOS is the latest version.

If you are using an older Mac, you may need to check the official Apple support documentation to confirm whether your model is still supported. Some older models may experience compatibility issues after upgrading the system.

In addition, third-party drivers installed in SIP (System Integrity Protection) may also cause conflicts. If there are any related situations, you can try to restore the default settings.

Hardware and external interference troubleshooting

If you have tried all the above methods but still can't do it, it may involve hardware issues. You can try the following methods to make a preliminary judgment:

• Take your Mac closer to the router to eliminate the problem of weak signal
• Replace other Wi-Fi network test to see if it still cannot connect
• Insert the USB wireless network card to try to access the Internet normally (if it is a problem with the built-in module)

If it is determined that it is an internal hardware problem, such as loose Wi-Fi antenna or damaged wireless module, it is recommended to go to the Apple authorized repair point to check.

Basically, these investigation directions can be solved by checking them in order.

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