elena wrote That is a well-known bug in Windows You can refer to http://www.computertipsfree.com/fix-error-651-wireless-modem-pppoe-broadband-internet-connection-in-windows-7-vista-xp/#ixzz26X1uTxt6...

I have tried that. But it came out an error 651.

thank you very much for your kind respond. My computer is windows 7. BTW, I don’t have a router.

Region : UnitedStates Model : TD-8616 Hardware Version : V7 Firmware Version : ISP : I have gat a TD-8616 TP-LINK ADSL2+ Modem. On the modem, the internet light is off and I can not connect to the...