I used the included HDMI cable. A window will appear on the monitor saying "HDMI input found, press OK to switch to this input". Tried every mouse button and key on the keyboard (it took a few tries because the monitor kept turning off with no input). Never could get a single picture. Luckily I had a VGA cable handy, it works great. If this monitor doesn't support an HDMI cable, it shouldn't come with one.
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