When you plug in the ethernet cable the corresponding numbered indicator on the router should flash to indicate a LAN connection and some data flow from the router to the computer. This does not necessarily mean that there is data flow from the internet to your computer via the router. Simple check would be to use a smartphone and try and connect to WiFi on the router but restart the router first. If the smartphone is also having problems then the problem may be with your internet provider or the router. If the smartphone connects then restart the computer. If the computer still does not connect then try the following steps to refresh the computers IP address:
For Windows XP
Step 1
Click Start->Run, type cmd and press Enter.
Step 2
Type ipconfig /release at the prompt window, press Enter, it will release the current IP configuration.
Step 3
Type ipconfig /renew at the prompt window, press Enter, wait for a while, the DHCP server will assign a new IP address for your computer.
For Windows Vista& Windows 7
Step 1
Click Start on the task bar, type cmd into the search box and press Enter.
Step 2
Type ipconfig /release at the prompt window, press Enter, it will release the current IP configuration.
Step 3
Type ipconfig /renew at the prompt window, wait for a while, the DHCP server will assign a new IP address for your computer.
For Windows 8 & Windows 8.1&10
Step 1
Press windows key and X key at the same time. Then click at Command Prompt.
Step 2
Type ipconfig /release at the Command Prompt window, press Enter, it will release the current IP configuration.
Step 3
Type ipconfig /renew at the Command Prompt window, wait for a while, the DHCP server will assign a new IP address for your computer.
Hope that helps.
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