Headphone sound mono and muffled

Aspire R7, Windows 7 - 64bit. Intel mainboard with nvidia graphics card.
Use to work, but after re-installation and later updates, it suddenly didn´t.
Sound, video and game controllers show: Intel Display Audio driver and Realtek High Definition Audio driver.
Playback devices only show "Speakers". It used to show more. And if Intel Display Audio driver is uninstalled, then Playback devices will show 2 HDMI digital devices, but then Speakers become mono.
In realtek HD Audio Manager -> speaker configuration there´s only stereo. There used to be surround, 5.1 and 7.1 also.
Installing the latest realtek driver does not change anything.
Installing the latest Intel HD 4000 graphics driver is impossible. Others have on intel website reported the same problem, that the intel 4000 HD installer alerts that the computer doesn´t match the driver.
Nvidia HD audio can not be installed. Don´t recall if it did or that was another computer.
But headphone sounds are muffled and mono, and when plugged in there is a popup selection of "Speakers", "Headphones" or "Headset": If "Speakers" are chosen then the voices are completely cut, if "Headphones"
are chosen they can be heard but distorted. And if "Headset" are chosen they appear clearer, but still muffled and in mono.

Hi,
This issue can be mostly caused by drivers. The driver issue can also cause the unstable performance of hardware device.
I suggest you uninstall all Video card and audio drivers, and update Motherboard driver and BIOS firstly.
Then, in device manager to install the driver for Video card and audio device.
If it doesn't work, check the event logs in Event viewer to see if there is any related recorder. Post back for our research.
Kate Li
TechNet Community Support

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