DP 1.2
DP 1.2
You just installed a new monitor and noticed the blank screen issue. You changed the display mode to 1.2 and it worked, but you're still missing 1.4. You've tested both your original cable and the one that came with the monitor, but they only support up to 1.2. Consider checking the cable connections or contacting support for further assistance.
Verify your monitor's specifications, ensuring it meets version 1.4 requirements. Then assess whether the device includes multiple ports; occasionally only one port will support 1.4 while others won't.