Hello SergRed, thanks for joining the Intel Community.
The cause of this behavior could be that the motherboard is still recognizing the video card as the output video.
I would recommend you to do a clear CMOS by removing the CMOS battery from the board for about an hour.
You can also run default setting on BIOS by pressing F9 key.
Try also to select the NVIDIA high definition audio as your default audio source.