I have two Dell S2740L attached to my Asus laptop. I cannot get both to work at the same time. It's one or the other but not both.
I have checked and both monitors and cables are good. It's just when I plug in one, I am fine, it works.
When I plug in the second, monitor 1 shuts off and monitor 2 comes on fine.
This is driving me CRAZY. All I want to do is extend my laptop screen to the two monitors.
FYI, when I go into the display settings on W10, it won't even detect the third monitor.
Other strange issues:
The HDMI port on Asus won't recognize either monitor, but when I plug the HDMI from either screen into a Cable Matters display link USB adapter, it does recognize the monitor.