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I bought a used LG 4K computer monitor someone was selling. It uses a special cable for 4K. The cable looks kinda like a HDMI cable, but it is a little different. There is a port on the computer for the 4K and the HDMI. When I plug in my regular monitor, which uses a HDMI cable, it shuts off the 4K monitor. Is there a trick to getting them to run at the same time? Thanks