Update the BIOS and check if doesnt work, try running a recovery on the sys.
If problem still persist than contact manufacturer as the sys has to be repaired
SOURCE: How to turn on the speakers on an HP Pavillion dv7 laptop
Go to your control panel and click the "find and fix problems2 link under SYSTEM and SECURITY then select the trouble shoot audio playback. Click next wait for it to search then select speakers and click next this should fix your issue.
Alternatively the volume setting for one or more sound devices might be disabled or set too
low. There are separate sound controls for the hardware devices (speakers / head
sets) and the individual applications (Windows sound / QuickPlay / Windows Media
Player). For example, if the speaker is turned on, but the application is muted,
you will not hear any sound. open the sound volume mixer and check the different settings
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