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lg 27ud69p

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    LG 27UD69P-W display with 5K iMac problem

    Just bought the LG 27UD69P-W 4K display to add to my new 5K iMac. I am using a USB-c to displayport cable purchased from Amazon (cable has all good reviews). I have the display working, but when I boot, it doesn't come "on". Mac OS recognizes the display, but it seems I need to unplug from...