Macbook not connecting to any Internet source

Hello, my Macbook recently, like last night, stopped connecting to the internet at all. This is a new Macbook, just purchased a few months ago, and I've never had a problem like this. At home I've got a Surfboard cable modem hooked up to a Time Capsule. I thought this might be the problem at first, because the Time Capsule has been reporting that it has no DNS servers. Today I took my Macbook to school to connect and it refused to connect even here where I know the connection is working. The school uses an http proxy to connect, but my computer has always been able to connect to the proxy as long as I turn it on. This time it says that I can't find it. I've tried plugging it in directly to an ethernet cord at home, but that didn't work either. Given, my home internet could be messed up. I haven't tried a direct ethernet connection at school, though I am not optimistic. Is something broken in my Macbook? Do I need an update? How would I get that if I can't even access the internet?

Are you able to administer your Time Capsule using AirPort Utility (located in /Applications/Utilities)?
Best of luck.

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