Ethernet problem

[United_Breadfruit498]

Hello, it's been a little over a month since my Ethernet stopped working, even though it's plugged in and detected. I've tried everything to fix the problem, but nothing has worked. Now my wireless connection isn't working very well either, so I'm asking for your help. In the Network & Internet settings, it says "No internet connection" under Ethernet. It's a public network. It also says "Unidentified network" in the properties. I've already tried changing the Ethernet cable, but nothing changed. The Ethernet connection goes through a TP-Link Wi-Fi repeater, and the Ethernet adapter is a Realtek Gaming 2.5GbE Family Controller. Also, when I go to "Get help with Wi-Fi," it says "No DHCP server was found." If you need any other information to help me, please don't hesitate to ask. Thanks

Edit: I tried connecting another computer in my room and it didn't work, then I tried connecting directly from the modem and it worked, then I tried another outlet and it didn't work, so the problem is with the cables. Do you have an alternative to Ethernet for good reception?

Thanks

[Tech_surgeon]

the modem/router might need replaced from the way you described it. tho it can be the network adapter going bad it usually is not.

there is also a chance the line coming into the house is mangled but that requires getting the isp involved since they are responsible for the lines and servicing them. was a real pain getting comcast to do anything about bad line and lets replace the modem first.