I have today my Logitech boxes for the sound of my monitor of the PS4 which is connected via hdmi I have plugged the usb cable of the boxes into the monitor now the boxes do not work
And why didn't you put it on the PS4?
Try to plug the cable into the PS4.
The monitor USB ports are not common ports through which data can be exchanged.
These are only intended for charging devices.
It's best to plug the USB cable into the console.
Then it'll be fine.