Win8 system can not connect to the network solution

Win8 system, why can't I connect to the Internet? In most cases, the Internet connection problem is caused by cable disconnection or the router and modem are not working properly. First, try running “Network Troubleshooter to see if it can diagnose and resolve the issue.
Open “Network” Troubleshooting by swiping from the right edge of the screen to the middle and clicking "Search" (If you use the mouse, point to the top right corner of the screen and move the pointer down. Click “Search”), enter the network troubleshooting in the search box, and then click or click “Set” and <; Identify and fix network issues”.
The following describes another way to open “network troubleshooting”. Swipe in from the right edge of the screen (if you are using a mouse, point to the top right corner of the screen, then move the mouse pointer down), and then tap or click "Search”. Enter your network troubleshooting in the search box, then click or click “Set” and <; Identify and fix network issues”.
If running a network troubleshooter does not resolve the issue, please follow these steps:
Make sure all cables are connected (for example, make sure the modem is connected directly or through a router to a valid phone jack or cable interface ).
Unplug the power cord from the modem and router.