An Ethernal cable is not properly plugged in or might be broken (Not fixed)

[Richard Zhou1]

Hi, I just built my own new pc and installed windows 10, but I cannot connect with the internet because "An Ethernal cable is not properly plugged in or might be broken". I tried almost all ways to fix it but none of them work, including:additional troubleshooters,command prompt: ifconfig /flushdns......,network reset,connect to network manually,Qos Packet Scheduler and change speed & duplex,Property and delete Network Adapters.Things come one after another, after I tried the above solutions, windows 10 constantly restart because of unknown problem, which I could not check because I did no

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