good evening to all, I have a macbook pro 15-inch touchbar and I do not know why when I connect the external monitor via an HDMI cable with a doc that I camped on amazon and down the main monitor goes into stop, why? do I have to have a monitor with usb input c?
Hello Jmacbookpr,
Thank you for posting in the Apple Support Communities. I understand you're having an issue using your MacBook Pro with an external display.
You mentioned you're connecting using what sounds like a dock; is that correct? Your MacBook Pro model supports video output using its Thunderbolt 3 ports with either Native DisplayPort output (USB-C), or using a USB-C adapter: MacBook Pro (15-inch, 2018) - Technical Specifications.
The following link is a great resource to determine which adapters you'd need for this: Adapters for the Thunderbolt 3 (USB-C) or USB-C port on your Mac or iPad Pro. Based on this link, since you're using an HDMI cable with the monitor, you'd need either this Apple USB-C Digital AV Multiport Adapter or a similar third-party USB-C to HDMI adapter/cable.
I hope this answers your question!
Have a great day.
HDMI to MacBook Pro TouchBar
