. Install the audio driver
Conexant CX20549-12 High Definition Audio Driver
When you install the driver it will give an error message [Media device not found]. Don’t get fooled by this. Now it’s your turn to take control of the system.
Open your “Device Manager”. Look for “High Definition Audio Device”. You will find a yellow mark beside it indicating that the devices is not working properly. Right click and choose to install driver. Don’t let installation wizard do any thing on its own. Don’t let Windows to search for drivers. Choose advanced option of insalling driver by choosing the location on your own. Then choose “Audio, Video, Games Controller” and then don’t choose any driver from the list given by Windows. Click “Have disk”. Now you need to look for a “swsetup” folder in your “C:” drive. This is the drive where HP drivers have been extracted automatically. Look for “sp36090″ [the number of the HP driver] folder in it. If you don’t find the folder in “swsetup” look for the folder in “C:” drive. You will find one “.inf” file in the folder [Don't go into the other folders within 'sp36090' folder]. This is the driver file for your audio device. Select it and proceed irrespective of any warning by Windows. You will have your correct driver installed.