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Out of the box this desktop supports only two monitors: one VGA, one HDMI. The USB to HDMI cable that you have probably requires a USB 3.1 port that supports DisplayPort Alternate Mode. I don't think that is available on this model. If you want to add a third monitor, you need to add a graphics adapter that may require upgrading your power supply as well.
Sorry, there was a problem. Please try again later.I want to use the USB port as well. Per secs... Type USB-C port - Charge or connect a display from one reversible port with 5Gb/s signaling rate. When I tried a USB C to USB C to a Philips Brilliance 27“ 4K monitor, it did not work, except when connected HDMI to HDMI. The monitor has USB C and Display Port video inputs. Seems like I just need the correct cable. Has anybody had any success?
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