Make sure that the DHCP service is open, and ping 127.0.0.1 no problem
Double system (different) can use wireless cable can use the

Renew the ipconfig/renew a Ethernet interface error: unable to contact the DHCP server, the request timeout

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Network environment is what kind of?

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To the DHCP server passing by?

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Which one is your DHCP server?

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Is not enough IP address, or you can manually assign an IP, and see if I can connect

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1 detection can set static IP connection
2 to test whether MAC binding problems
3 test whether someone private meet on network equipment

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Wireless can on the network, the DHCP, wired network and the main line in the middle of the switches (if any) problems?

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The landlord to see the local network of ipv4 setting in your school is a fixed IP or automatically obtain the general this kind of problem with Windows built-in repair can be ruled out, if it doesn't look at the problems such as network interface also can not detect the network card is normal