Built-in Digital Input - Tap Tap Tap Noise

Hi Guys,
Can someone out there confirm the following as normal behaviour or
otherwise -
Using Linein software (by rogue amobia) when i select "Built-in Digital Input: Digital In" as the input source and output this to "Defaul System Output" I get a loud tap, tap, tap ..... sound (it runs constantly), I also get this in Sound Studio when I select Digital Input as the source.
I have nothing connected to the Digital input of this computer so why do I get this tapping noise???
Thanks In Advance
Lee

I've had problems connecting my computer to my cable box as well. Comcast apparently disables some of the functions on its boxes. Call your cable company. It's most likely a problem with your box, not your computer.
Good luck and if you find the problem let me know.

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