I have a 15" macbook pro with 4 USB-C/thunderbolt 3 ports. I bought a multiport adapter from USB-C to HDMI and also a U2417H dell monitor which has 1 DisplayPort, 1 Mini DisplayPort and an HDMI port.
Every time I plug my mac into the monitor, I have to reboot it. Sometimes however, the mac will recognize that it is connected to a Dell monitor, but the monitor stays and with the message "No Signal."
I haven't tried a USB-C to HDMI cable or a DisplayPort adapter or cable because I want to ensure that there is not an issue with the monitor before I buy anything else for it.
The monitor works fine with a windows machine using the same HDMI cable.
What could be causing my monitor to have these issues?
Best Answer
I have same problem with MBP 2017 15" with plain Full HD monitor. MacOS always says it is connected but no signal to the monitor.
As Jackson1442 says, rebooting sometime works but not all the time.
My MBP 2014 has no problem so I doubted my hub and then the hdmi cable. I replaced those but no changes.
I now doubt about 2017 model itself as Mohannad Kattan mentioned. It is so annoying.
I will try USB-C to HDMI cable without hub.