Archived from groups: alt.comp.hardware.pc-homebuilt (
More info?)
Air Force Jayhawk wrote:
> On Sun, 24 Oct 2004 19:46:31 -0400, Air Force Jayhawk
> <airforcejayhawk@comcast.net> wrote:
>
> I recently moved my computer into a new desk. I have an Altec Lansing
> 5.1 speaker system with a Soyo motherboard with imbedded 5.1 sound
> adapter. Ever since I moved the system (which required disconnecting,
> rerouting, and reconnecting every wire and cable), I have a very
> annoying low frequency as well as occasional clicks and other random
> noises from the speakers. I have ensured all of the connections into
> the subwoofer are solid but that didn't fix it.
>
> I would be sure it was power related except that it comes and goes
> based on what is being displayed. For example the hum becomes much
> more noticeable with the 3D Windows XP screen saver up. Also, when a
> window is being dragged around the screen I hear another buzz,
> although higher frequency this time.
>
> Thinking it might be the monitor, I turned it off. No fix. Then I
> disconnected the video cable...again, no improvement.
>
> Just today I installed a UPS. One, I felt I needed one, but I had
> hoped that the buzz would go away either by the UPS or by the fact the
> lines would be all pulled apart and reconnected, possibly by chance
> separating the troublesome cables. No luck.
>
> Please note it was fine before...so environmental issues like
> neighbors phones are not a player. It has been suggested earlier that
> it might be my wireless router (it is closer to a speaker than it was
> before) but again I point to the fact that the sound intensity varies
> based on the screen display but does NOT change when I disconnect the
> monitor. Could they still be related???
>
> Any other ideas?
>
> This is driving me absolutely nuts!
>
> AFJ
Do you have front audio sockets on your machine ?
I had the same problem on a MSI K8T NEO AMD 64 machine running Linux
With the speaker volume turned up I could hear a light throbbing sound when
moving windows and on some 3D apps (like screensavers or games) I got a
very odd buzzing/clicking sound. Muted all inputs, moved speakers, rerouted
signal and power cables.
In the end I discovered that it was due to a front panel audio connector,
the cables on my case are obviously low quality and not very well screened,
the way front panel audio is usually wired when nothing is plugged in the
front audio signal has to go up to the front connectors through a shorting
switch (that is only shorted when there is no plug in the front panel) and
back down to the main board to go out of the rear connector. That adds
quite a bit to the audio path (and all through unscreened cable in a
"electrically" noisy tin box).
I didn't need the front audio sockets so I unplugged the cable and replaced
it with the two original shorting links on the front audio header..Not only
have the funny noises gone but the general sound quality seems a little
better.
Just remember that you need two jumpers to short the left and right in's and
outs if you yank out the leads for front audio (otherwise you will have no
sound at all) your systemboard manual will tell you the correct placement.
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