There are several possible reasons why a wired network may not work:
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1. Network cable connection: Check whether the network cable is properly connected to the port of the computer or router, and ensure that the network cable is not loose or damaged.
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2. Network Settings: Check the network Settings of the computer to ensure that the network Settings of the wired connection are correct, including IP address, subnet mask, default gateway, etc.
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3. Router problem: If the wired network cannot be used, you can try to restart the router or connect the network cable to another available port to eliminate the possibility of router failure.
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4. Network adapter problem: Check whether the network adapter driver of the computer is normal, if there is a need to update the driver or reinstall the network adapter driver.
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5. Network failure: Sometimes, the wired network may not be connected properly due to network failure or network provider problems. You can contact your network provider to check whether the network is faulty.
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If the above methods fail to solve the problem, contact the network provider or professional technical personnel for further troubleshooting and repair.