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HP Recommended
Macbook Pro 2017
macOS 10.14 Mojave

I use a Macbook Pro 2017, that I connect to my HP Envy 27s via a HDMI cable (and adaptor box). 

This works absolutely fine, provided that I connect the monitor before I turn the Macbook on. If I disconnect the Macbook afterwards (say to take it to a meeting), I have to fully restart the laptop in order to be able to get the screen back, else I get an error on the screen saying "Input Signal not found, check the video cable ...".

Often the Macbook recognises that the monitor is connected, it comes up on my Display Preferences (and the windows switch to where they would be on the other monitor), but it doesn't actually show up.

Restarting will fix it, until I need to restart again.

The same issue is true for the other people in my office with similar Macbooks and other Envy 27s monitors.

Thanks for any help.

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