Windows 10: internal speakers - not sure if my problem is a setting

I got a new Dell Optiplex 990 a few days ago. It was working fine until I plugged it into a Samsung 244T 24 inch monitor older monitor. I am learning how to move around in WIN 10 as I had been using windows 7 before. At some point I noticed that there was no sound coming from the computer there are no speakers no speakers in the Samsung. I plugged the computer back into my Acer monitor which I had been using before the Samsung with no problems. I figured that maybe I had set something while I was poking around on the Samsung. It is the internal computer speakers and not the audio

:)

 

Switching off internal computer speakers

This is a subject that has been raised before but Microsoft seems to refuse to answer. As a result of a previous update to Windows 10, the internal computer speakers work as well as the external sound system. There is no apparent way to switch off the
internal speakers and just have the external sound system working. A previous contributor suggested that Microsoft had a solution to this bug but wouldn't elaborate. This seemed very childish.

I ask the question again: Could someone give a step by step process for switching off internal computer speakers AND leaving the external speakers working. I have tried every setting but nothing fixes the problem. Surely this isn't rocket science and
it would be easy for Microsoft to write a bug fix???

Lack of action just infuriates users unnecessarily.

 

no sound plays through internal speakers

I cannot get any sound to play through the internal speakers of my laptop. It did play previously. The speaker in the task bar has a red and white x and the trouble shooter says no speakers headphones plugged in. When I pull up the info on sound it lists
its location at HDMI port. Suggestions?

 

Speaker problem

Try this out:

Right-click the sound icon near the clock and choose Playback devices. Then, make sure your internal speakers are set as the default in the list.