High Frank,
The power supplies of both of those computers, are earth grounded.
In order to get red of that hum noise, the earth ground pole on both power supplies will have to be disconnected. But I wouldn't suggest doing it yourself unless you really know what you're doing. I am telling you this because, long after the computers are unplugged, there is still electricity left over in the power supplies.
This is because the capacitors stores that electricity.
Hope this helps.
My best regards.
 John.
PS. You mite want to copy the audio file on computer A to a USB flash drive, and paste it to computer B.
That is one way you can transfer audio from one computer to another.
----- Original Message ----- From: "Frank Ventura" <[email protected]>
To: "PC Audio Discussion List" <[email protected]>
Sent: Thursday, March 18, 2010 4:41 PM
Subject: Recording one computer from another


Hi all, I am trying to record the output from one computer to the line
in input of another computer. I am recording on a Windows 7 64bit
computer with 8GB of memory and a Realtec on board sound. If I plug a
1/8 male cable in the line in jack and the other 1/8 end of the cable in
another audio device such as the NLS player, battery powered radio or
laptop running on battery power everything workd fine. If I plug the
source end into a computer that is plugged into 110vac hosehold current
I get some really noticeable feedback and buzzing. Is there anything I
can do that will eliminate this?
Thanks
Frank

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