Dell Latitude E7250 with Windows 10.  

I want it to play a music file as a wakeup alarm.  

So I made a task to play the music file and scheduled it to run at a certain time.  It does wake the computer out of sleep, but the music file doesn't actually play until I press the power button. 

The display also remains dark until I press the power button.  

How can I get it to start playing the music file automatically, without my intervention?