No sound on the HDMI monitor?

Have ordered a new monitor has an HDMI connection and built-in speakers. So if I connect the monitor s.der PS4 via HDMI comes Picture and sound, if I connect the monitor s.Laptop via HDMI synonymous Picture and sound but if I connect the monitor s.PC via HDMI comes only Picture and no sound except if I Connect the headset. In the lower right corner of the Windows bar, the speaker icon has a red cross in front of it without a headset. I've tried and googled for hours now but nothing helps. PC has also installed all drivers. And as I said Monitor has built-in speakers and is connected via HDMI. I hope someone has a solution for me, I would be very happy.

Make a right click on the speaker and look there under the sound settings what is selected there as the output device. There you have to change it to the HDMI output if it is not yet set.

Did you change the playback device to the monitor in Windows Sound?

Is additionally a speaker plugged in via a jack?

Left click on the loudspeaker symbol displays all connected audio devices and then you simply click on your monitor.

During playback, my monitor is not displayed.

During playback, my monitor is not displayed.

What is displayed?

Speaker

8 - Realtek High Definition Audio

not connected

When playing is with me:

speaker

8 - Realtek High Definition Audio

not connected

Monitor is not displayed and right-click above '' Speaker Setup UNKNOWN ''

Do not need a jack The sound comes via HDMI or not. With my PS4 and laptop I did not need a jack plug