I'm having the same problems that the OP was having. But, these problems honestly came from NOWHERE. One day while just talking to someone on Skype, my internet decided to stop working. So I googled for a bit, and disabled ipv6 and manually entered an IP address, default subnet mask, changed...
I'm having the same problem, and have tried all of the same "fixes" that the OP has. All of them have not changed to the fact that I cannot gain internet access on my laptop.