Have you checked on the Volume Control panel (double click the Volume Control icon on the System Tray) that one or more input/output sections are not muted?
I would also presume that you would have to have the correct audio codecs installed/enabled.
HP Envy x2 review: Hands-on
Iconic New York graphic designer Milton Glaser on his uplifting new subway posters
New iMac Pro release date, UK price & specs rumours
Comment suivre le parcours du père Noël ?