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I just got a new MBP, and I bought a Thunderbolt 3 to Thunderbolt 2 adapter, assuming I could use the VGA, DVI and Ethernet adapters that I already had, so I would only have to buy 1 adapter instead of 3 more expensive ones.

The ethernet adapter doesn't seem to work, and I can't get picture using the DVI or VGA adapters. I'm having trouble finding documentation - is that setup supposed to work? If so, what should I check?

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That's the way it's "supposed" to work, but judging by the reviews on both Apple's own website and on Amazon, (two and three stars respectively), it's not doing so well.

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There is however, the Cable Matters Thunderbolt 3 to Thunderbolt Adapter that gets high reviews though (IMO) is not as good looking as the Apple design. Though for me, it could look like a brick as long as it worked.

That said, generally speaking, I don't like converting signals, it's just another potential point of failure; instead I like going from "native connection to native connection" so it not only reduces the number of physical conversions, but the protocol conversions as well. While this will be a sore spot with many of Apple customers that invested heavily in adapters for their previous generation MacBooks, the consensus is that USB-C is here to stay.

Your best bet is to put those older adapters up on eBay and get new ones.

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