Ethernet problem.

Peter Woodhouse 85 Reputation points
2026-10-22T04:32:03.4266667+00:00

Windows 11 Pro. 26H2. Build 26300.9711

Running 5G mobile wi-fi adapter for internet and using ethernet cable for computer. Been using it this way for 3 years when suddenly the ethernet drops out and wi-fi takes over. Have checked the adapter, everything looks good there.

Changed the ethernet cable, but still only have wi-fi available.

Any ideas???

Cheers,

Peter.

Windows for home | Windows 11 | Internet and connectivity
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Answer accepted by question author
Ivan B 127.5K Reputation points Independent Advisor
2026-10-22T07:07:55.26+00:00

Hi,

That’s strange. Let’s try a simple test: shut down your PC completely and unplug it from the power source. Wait about 3 minutes, plug it back in, and turn the PC on. Once it boots up, check to see if the Realtek network driver reappears.

If it doesn’t, we’ll need to take a look at the BIOS to see if the option has been disabled.

Thanks.

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  1. Ivan B 127.5K Reputation points Independent Advisor
    2026-10-22T07:01:41.86+00:00

    Hi,

    That’s strange. If the port is being recognized but there’s no network driver in Device Manager, are there any drivers showing an error or listed as disabled?

    If so, please take a screenshot and post it here.

    Thanks

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  2. Ivan B 127.5K Reputation points Independent Advisor
    2026-10-22T06:49:07.43+00:00

    Hi,

    Something is wrong; you are missing the network adapter (in this case, a Realtek GBE). Did you make any changes to the BIOS?

    Please check your desktop—is the light on the Ethernet cable on?

    Thanks

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  3. Peter Woodhouse 85 Reputation points
    2026-10-22T06:22:37.03+00:00

    Screenshot 2026-10-22 172023

    No unknown devices detected.

    Peter.

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  4. Ivan B 127.5K Reputation points Independent Advisor
    2026-10-22T06:08:50.8833333+00:00

    Hi,

    It seems the driver is missing. Please go to Device Manager, check the "Network adapters" and "Unknown devices" sections, take a screenshot, and post it here.

    Thanks

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