Hello Everyone
I am sorry you are having issues with your audio on your computers. I would encourage you to post your product number for your computer. I am linking a document below that will show you how to find your product number. As well if you could indicate which operating system you are using as well as whether your operating system is 32-bit or 64-bit as with this and the product number we can provide you with accurate information.
How Do I Find My Model Number or Product Number?
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c00033108
I would like to thank you once again for posting on the HP Forums and encourage you to re-post with the required information. Have a great day!