So it fits the display on the HDMI device. With the secondary display to detect already connected to the Mac, do the following: Go to the Apple menu and choose System Preferences. The MacBook should automatically detect the external display. If the Vizio has a menu setup, set it to HDMI input. Try a different adapter if you are using one. You can change the arrangement in Settings > Displays > Arrangement. Monitors: Samsung S22E310H (Monitor 1) + ViewSonic VA2246m-led (Monitor 2) +. NOTE : if you have a Benq monitor (especially the BL2420TP), try this first : fixed : Benq monitor stays black when MacBook is switched on. dmg’ several times since installing Mojave on my new laptop, however, it does not appear the new drivers are installing properly. The monitor is Dell U2412, which doesn’t have an HDMI input, and thus I’m using an HDMI to DVI adapter between the HDMI cable and my monitor.
'If it were an HDMI connection, I would have found it hours ago. The HDMI signal may not have been detected when you connected the cables to the adapter.