Chaintech AV-710 Buzz problem

[msh213]

Hi all,
I have a Chaintech AV-710 sound card in my computer...and have for a few years. I used to have my sound coming through the optical output into a hi-fi stereo receiver....everything was perfect from movies to music. I have since moved and have my computer separated from my stereo

. Now I have recently connected my computer to my TV (audio and video) through a long S-Video/RCA cable (RCA converted to 3.5mm headphone jack into the computer). There is a very annoying feedback that comes through the TV speakers (not through the computer speakers oddly). Also, the feedback comes through the TV when the computer is off (quieter though). I tested the cable with my ipod and there was no feedback. I tried another cable and the feedback is still there. I moved the card to a new PCI slot and also updated the drivers. Any more ideas? Is this some type of grounding issue? If you need more info, just let me know because I would love to fix this pesky buzzing.
Thanks,
Mike

 

[HiFiRE]

Try muting the line-in/mic.

That will likely do nothing since even when the computer is off there is buzzing. Nevermind.

 

[fjf]

Try removing the ground connection from one of them. If disconnecting the ground from the computer there is no noise, then you got a ground loop. All grounds from connected equipment sould be connected to a common point; if all of them have grounds to the outlet AND the instrument grounds are connected between them through the audio interconnection cables, there is current flowing causing electrical noise.