I ask the following without a trace of snark intended: Could the speakers be muted?
I have a HP 15-g035wm that had Windows 8.1 that has been upgraded to Windows 10, now including the fall update, and is working fine. However, this laptop has an indicator light on the keyboard (on the f6 key, which is used to mute/unmute the speakers) which makes it easy to tell that they are muted. Is your volume icon showing in the system tray at the lower right? If so, what does it look like? Here are screen captures of mine in sound on:
and muted states:
Is anything odd looking, such as a yellow triangle with an exclamation point in it, in front of your speakers in Device Manager? This is a screen capture of Device Manager for my fully functioning speakers:
What do things look like in Volume Mixer, which you bring up by right clicking on the volume icon in the system tray?:
Volume Mixer.jpg 32.3KB
These are a few things to check on to see if anything looks amiss.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
In a modern society where everyone thinks their opinion deserves to be heard nothing annoys me more than individuals who mistake their personal preferences for fact.
~ Commenter TheCruyffGurn on the The Guardian website, 8/13/2014