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I am trying to connect my MacBook Pro 2018 to an external screen, HP EliteDisplay E231 with a HDMI-DisplayPort cable, but I only get a "No signal" sign on the screen.
I've tried changing settings etc. but nothing seems to work. Who can help me?
According to HP, that monitor supports VGA, DVI and DisplayPort.
Chances are your HDMI-to-DisplayPort cable is not doing what you want.
I would look at another Thunderbolt-3 dock that either supports VGA, DVI and/or DisplayPort directly and not play with cables that are going to try switching in the wire.
If your existing Thunderbolt 3 dock has a Thunderbolt 3 out (not a pass-thru power, and not the port that connects to the Mac, but a TB3 port that will drive additional Thunderbolt 3 devices, then you could look at getting a dedicated Thunderbolt 3 adapter just for the monitor.
For example, I have a CalDigit TS3 dock with a DisplayPort and Thunderbolt 3 ports. I have a DisplayPort cable going to a 32" 4K DELL monitor, and I have the TB3 port going into a TrippLite Thunderbolt 3 to DVI/USB3/Gigabit adapter that is driving a Samsung 1080p monitor via DVI. The CalDigit has all the ports I really want, but I needed something for the Samsung monitor, and I had the TrippLite adapter available. I just ignore the USB3 and Gigabit ports on it.
My point is that use the right Thunderbolt 3 dock for the job.
According to HP, that monitor supports VGA, DVI and DisplayPort.
Chances are your HDMI-to-DisplayPort cable is not doing what you want.
I would look at another Thunderbolt-3 dock that either supports VGA, DVI and/or DisplayPort directly and not play with cables that are going to try switching in the wire.
If your existing Thunderbolt 3 dock has a Thunderbolt 3 out (not a pass-thru power, and not the port that connects to the Mac, but a TB3 port that will drive additional Thunderbolt 3 devices, then you could look at getting a dedicated Thunderbolt 3 adapter just for the monitor.
For example, I have a CalDigit TS3 dock with a DisplayPort and Thunderbolt 3 ports. I have a DisplayPort cable going to a 32" 4K DELL monitor, and I have the TB3 port going into a TrippLite Thunderbolt 3 to DVI/USB3/Gigabit adapter that is driving a Samsung 1080p monitor via DVI. The CalDigit has all the ports I really want, but I needed something for the Samsung monitor, and I had the TrippLite adapter available. I just ignore the USB3 and Gigabit ports on it.
My point is that use the right Thunderbolt 3 dock for the job.
Swap parts.
Try a different HDMI cable.
Try a different display.
Try a different HDMI source with this display.
Try a different USB-C-to-HDMI dongle.
See what happens, and if and where the problem moves...
Cannot connect to external screen - hdmi to display
