Need help
Need a bit more info on the issue. What are you using the ethernet to connect the PC to? A router? A modem? If you are connecting a new PC to a stand alone modem, which would only have 1 ethernet on the back, then you need to reboot the modem for the PC to get a IP.
If you are connecting to a router, are you getting a IP? Windows Key + R > CMD > Ipconfig. There will be a bunch of stuff, but what you are looking for will look something like this:
Windows IP Configuration
Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . :
IPv4 Address. . . . . . . . . . . : 192.168.1.136
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
PS. You said you tried with a new cable in the living room. How do you have a ethernet connection in your room and the living room? Do you have ethernet jacks in every room? If so, what connects them all together?

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