Windows8 connection network reported 651 error

bought a Sony computer, the network card is realtek pcie gbe. I bought a router that is TP-Link. According to the manual, log in to 192.168.1.1 to set the wireless connection name, network user name, and password. Sony computer can be connected to the wireless, wired is not connected, reported 651 error, other computers can also be connected, began to think that it is a network card driver problem, update driver problem is still not resolved. Later, I found that even the network port corresponding to Sony's computer router is not bright, and my heart is a little embarrassed. I am afraid that it is a network card problem, the same network cable, other computers are ok. Simply plug in the network interface, the router's light is on, it seems hopeful. Restart the computer and set the network connection ip to automatic, it is connected. Finally the problem is solved.