My HP Eny 4-1121 Laptop's Windows volume control (small icon on the right corner screen & the physical key on keyboard) stops responding after couple of minutes once booted up.
Tried rebooting again, it works for couple of minutes back to non responding state.
When playing video, no sound at all.
What's happening?? This laptop is less than a year old and there hasn't been any changes to the hardware or software. Not even any upgrade to Windows 8.1 as per suggested.