* What specific Mac model?
* List all of the Mac video out ports

* The P2714H has the following video in ports = DVI/VGA/DP
The Mac Thunderbolt to P2714H DP in port works.

* Via a straight conversion cable, a PC HDMI out port cannot "upconvert" to a monitor DP port

I must have explained myself wrong. 

It works from DP monitor Dell to Tunderbolt mac.

I does not work from DP monitor Dell to HDMI or USB-c PC.

What do I need to make it work on PC?

Thank you

OK, what PC model? What PC video card/GPU? List all of the video out ports on the PC video card/GPU.

MSI Katana GF66, 15,6'' FHD. Intel Core 7 11800H. 512 GB SSD RTX 3050

HDMI and USB-C

Thank you