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I bought a new 2017 iMac 27", but I still want to use my 4K monitor. I was using the monitor with my 2012 MacBook Pro just plugging in the mini-DP cable into a Thunderbolt 2 port.

I tried the "All Smart Life" USB Type C to Mini DP adaptor, which advertised that it worked on the new MacBook Pro, but it didn't work on my iMac.

Does anyone know what adapter I can use to connect my new iMac to my 4K monitor?

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Thunderbolt is a "multiplexing" of several signals including DisplayPort so the signal already exists there. You just need a Thunderbolt to DisplayPort cable that goes from USB-C to DisplayPort (or mini DisplayPort if necessary) and you will be able to connect your 4K monitor.

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