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Problems with 4k monitor


I am having problems connecting my Surface Book v1 to a 4k monitor.

I first tried connecting to the monitor's DisplayPort input via the Surface Dock 1. I can sometimes get it to display for a minute or two, but it eventually just starts flashing off and on.

I then tried connecting using DP on the dock to HDMI input on the monitor. I am using the Surface mini DP to HDMI adapter. Pretty much the same issue.

Next I tried using the mini DP to HDMI direct from the Surface book to the monitor. In this case, it stays connected, but maximum resolution is 1920 x 1080.

This worked fine with my old monitor, which was a Dell Ultra Wide running at 3440 x 1440.

Any advice? Thanks!!