1) If it is the problem of broadband itself, first directly connect to the broadband network line test, if it is the problem of broadband, contact the broadband customer service to solve.
2) If it is a router problem, if the original can be used, temporarily can not be used, my own practice is a cut off the router's power in the plug, wait to see. In the factory is to restore the factory Settings, the new strict according to the manual Settings can be used, they do not understand, do not recommend their own Settings (this is the premise of the correct physical connection, sometimes is the router to find IP address slow or failure caused, not to say that the router is broken). If it always doesn't work out, it is recommended to call the customer service of the router, they have online guidance over the phone, I encounter problems that I can't solve, it is very useful to ask their advice, they will give you the correct advice for your Settings or operations.
3) If the wireless switch is turned off, if the wireless is connected with software, it is normal that the software is not good to use and often problems, there is no better way to use the router. In addition, the NIC driver is not or inappropriate caused by the network cable interface or network cable is not a problem.
4) If it is caused by system problems, it is recommended to restore the system or reinstall it. I practice mobile phone or another computer, TV, QQ, etc., can access the Internet, not necessarily your computer can access the Internet, the method to see the above answer, there are questions to ask me.
5) Please ask me if you have any questions.