HP Pavilion Dv7 Windows 7 No sound through headphone jack or speakers

Hello. I have been having trouble with the sound of my laptop for quite some time. 
I discovered this forum, and was trying to find my laptop's problem, except I found that I could not find a thread that pertains to my laptop's individual problem. As stated in the title of this thread, my laptop does not play sound through the headphone jack or speakers. However, when I plug in a usb headset the sound works. I want to rule out the possibility that this is something I can fix myself before I have this computer sent in to be repared. 
I have tried uninstalling and reinstalling the software that runs the sound (I forget what it's called). I also tried turning off the laptop, removing the battery and holding down the power but ton for 30 seconds; that didn't work. I have tried making headphones and speakers the default audio, except that didn't work either. It seems that maybe my laptop is just broken, and this is the second time this has happened. (The second time, what the hell!)

Hello Pandabear277 and MicrosoftUser,
What is your product number and operating system?
Thanks
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