Please send us a picture of SN on the bottom of the PC.
① Update the driver. We will provide you with the corresponding driver based on your SN number.
② Right-click the desktop → Display Settings → Click the “Detect” button. Select “Extend these displays” or “Copy these displays” in “Multiple Display Settings”.
③ Interface problem, if it is a DP interface, you need to use a DP cable
④ Please try to change the HDMI cable