回复: 我不行了 大家帮帮我吧 有一台电脑就是不能上网。。

1. check the connection and make sure that there is no contact problem.
2. Start - Run - "ipconfig /all" to see if your PCs' IP on same network (but the last set should be different). Ping the router and PC's IPs and see if they are alive.
3. switch the two network cards and see what happen.

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