How do I wake up the screen after it's gone blank?

I am relatively new to the Mac, so my question might be stupid...
Anyway: After the screen goes blank (due to the energy saving setting), how do I wake it up again? In any other OS that I know, I just move the mouse a bit, or I press a key that does not interfere (such as "Shift"), and the screen comes back to life.
Not so in MacOS Maverick. Sometimes it does wake up, but mostly it doesn't. Sometimes it helps if I unplug and replug the screen, but again not always. Sometimes it helps if I click a mouse button, but again this is unreliable. Or am I just too impatient, and eventually it will wake up after I moved the mouse?
The same is true after the Mac went to sleep. After wake up, the screen very often remains dark. I try the same things as above, and most of the time the screen eventually comes back to life.
Am I missing something very obvious here?
Thanks! Martin
P.S. I am using a Mac Mini (latest model) with an external HP display attached via display port.

Hello bburkholder,
I would suggest following the document at the link below. It sounds like you have done some of the steps within the document, but the other steps may provide you a solution.
http://h10025.www1.hp.com/ewfrf/wc/document?docnam​e=c02844556&tmp_task=solveCategory&cc=us&dlc=en&la​...
If I have solved your issue, please feel free to provide kudos and make sure you mark this thread as solution provided!
Although I work for HP, my posts and replies are my own opinion and not those of HP.

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