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My motherboard X79-UP4 Running Windows 8 Enterprise, Has a weird problem when trying to use the microphone port.

Not really sure how to describe the sound so have attached a link below.

Here is a sample of the audio. Sound Sample

So Far I Have:

Update the bios.
Reinstalled the drivers.
Updated the drivers.
Tried Multiple Microphones.
Tried Line In

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up vote 0 down vote accepted

So after lots of investigation. It seems Windows 8 is to blame. I have tested on Windows 7 with no problems.

Problem is resolved

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