I upgraded my PC (Intel i7, Radeon RX 550 Graphics card, 16 GB RAM) but am using my old monitors (Dell P1914S). 1st monitor using a DisplayPort cable works fine. But, 2nd monitor which uses a DisplayPort (connected to the monitor) to HDMI Adapter and an HDMI cable which is connected to the Radeon card. Am I doing something wrong or will this set-up just not work? When I use a DVI cable, the 2nd monitor works fine.