How to fix the sound of HP pavilion dv6345us

Try reinstalling the driver.
Confirm that it has installed by testing audio in control panel in windows.
Finally try re sitting the audio connector internally.
Worst of all, audio card is damaged..(very unlikely)

Sure, get the Correct HP driver for this exact pc but, but but...
The windows sounds are dead. (do that yet>, CP + sound test)
CP = control panel
try to know , most HP made,
dv6345us, can have 3 sound chips as an option day 1 new!what you have is clearly stated in the service tag that you did NOT
post, the number ending in ABA# is THAT number.
the chip and PC and the unstated OS all must match

windows what? you never said so i cant match that either.
VISTA????????? vista 32 bit or 64????????
but the other way is what, sure, guess.
read the drivers at HP and try all there.
for sound chips (aka audio)

This HP computer is 11 years old. now. (2007)
HP dropped most support on it this old, (SOP)

one sound chip is Conexant AC -Link Audio
lets say you said (service tag) RV214UA#ABA
and you said VISTA> what works there.
the secret is deep, lacking full spec, from HP.
finding Conexant drivers is not easy, lots of hits all virus sites now.
lets first look .
does device manager show it as bad.
CP+DM see sound there. is it red, yellow or Unknown marked.
go to CP again control panel
click sound is the Conexant still there.
the window for sound has a speaker is it selected?
select speaker then properties lower right.
then pick enhancements
hit checkmark, disable all sound effects
click tab levels, turn up volume.
can you do all that, i bet not, its got bad drivers for this chip
VISTA btw is dead so asking MS to update driver is dream of dreams, hopeless, now and for sure forward.
you dont have the HP install disks so that source too is missing.,
leaving you , VISTA and MS and HP and conexant in the lurch.

if microsoft was not dead and your internet was alive (is it)
the remove the driver, and reload, it under device manager.
it then magically PnP reloads from MS but not if the MS driver servers are off line as they sure are. (1/2 or all) (ms secret this is)
Hard this is,::::, 1ST OFF, is HP ended support,
ON YOUR PC NOW.
2nd VISTA support has ended at MS. (double dead)
3rd factor (bad) IS Conexant maker of chip and their Driver. IS DEAD. TRIPLE DEAD.
SHORT WHY>?
synaptics Bought out Conexant in 2017, and shows no support NOW. FOR THAT.

the Snaptics web site lists nothing on the words driver or conexant. zero support, but do call them,,,?
SO that ends that foray.

leaving all those malwares sites offering this driver, only. ? many we can find it this magical way. the FAMOUS DRIVER PACKS site. (all safe ask)

the one place on earth with no malware is here.
this is the vista set 32bit only 64 is on other page
there are 15 drivers for Conexant. there. get them try them.
end story

http://driverpacks.net/driverpacks/windows/7/x86/audio/11.11