I had my new HP Pavilion x360 14 cd0087TU laptop delivered to me on 12th Sept. 2018. It was protected by McAfee virus protection free for a period of 1 month. Everything worked normally during this period.
Subsequently on 11th October 2018 I subscribed for Kaspersky Internet security. Some time later when I played a video file I noticed that sound is absent. I carried out all troubleshooting procedures prescribed and the checks including drivers updating but it says that all is OK. It took me a while to suspect that this happened after I had installed Kaspersky Internet security. I had also noticed that my Internet banking does not work correctly with 'Safe money' hence I deactivated that. In the same manner is there anything that blocks sound from the Laptop speaker?
I am able to listen to the audio along with video when I screen mirror my files to my television.