Just to make things even more mysterious, I returned home and tried my VGA monitor with my VGA cable to the mac with the same adapter and everything works great. None of this worked and also connected my adapter with the same cable and monitor to another Mac belonging to another person next to me and it worked. Restart the MAC with the cable and adapter connected.Here's what I did to try to solve the problem: Supporting a maximum video resolution of 1080p, this user-friendly adapter ensures a quality viewing experience and features a sleek, compact design.This video adapter allows you to take video. Simply connect the adapter to a USB-C or Thunderbolt 3 (USB-C) port on your Mac or iPad and then to your TV or projector via a VGA cable (sold. The versatile Dell HDMI to VGA adapter enables the user to view video content from any laptop or tablet with HDMI video output on a variety of VGA-compliant displays, ranging from monitors to projectors.

It also outputs video content like movies and captured video. When I connected the cable in question the mac turned black for a second (as if it had recognized it) but then it didn't really work (in the display settings the second screen wasn't really visible). The USB-C VGA Multiport Adapter allows you to mirror your Mac or iPad Pro display to your VGA-enabled TV or display in up to 1080p HD. The VGA cable was about 20 meters long and was connected to a plasma screen that had only the vga as a connection. I am a video operator and I was at the theater, connecting my American Macbook Pro Retina Late 2013 (macOS Mojave) with a Thunderbolt / VGA third-party adapter.

Mac vga adapter work on dell