Plug an Ethernet cable for network adapter

[Windows 10]

I am using Windows 10 and my laptop recently was not able to connect to the internet. When I tried troubleshooting, it says "A network cable is not properly plugged in or may be broken". I'm using my router as usual and have never use a cable to connect to the internet before. So i have no idea what that mean..Another pint is that when i turn the WiFi on and off the wifi icon in my keyboard usually turn white when it's on , but it's red now and never change, although it say in the screen that's it's off

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