Modem sound on iMac

[coolness]

Hello all.
This is my first time on this board. I have been a mac user for 8 years now.
I have a problem with my iMac 600SE which has been there since I bought it almost a year ago.
When I am connected to an ISP with the internal modem I get a noise that sort of rumbles (noise) at low volume that comes through either the internal speakers or the sound out. This annoys me as I have a high quality stereo system which the iMac is connected to through RCA cable. It is quite noticeable and fluctuates as I click on menus and move things around the screen. Like it stops for a split second when I click on a menu.

I had the 266 iMac before and I never had a problem with that. Has anyone ever had this problem and is it likely to be a modem fault or a software fault. I am running macosx 10.1.4.

cheers
Steven Litherland

 

[davidanders]

Two audio components can have background noise problems due to grounding.
A search at www.google.com for "common ground noise" brought up this...

Ground loop problems and how to get rid of them
... a common ground through different paths, a ground loop occurs. Currents flow through
these multiple paths and develop voltages which can cause damage, noise or ...
Description: Ground loop problem solving pages which tell how to get rid of those annoying humming problems in...
Category: Arts > Performing Arts > Theatre > Stagecraft > Sound
www.hut.fi/Misc/Electronics/docs/groundloop/

Common Ground Solution

 

[Dradts]

im having the exact same problem wit my imac 500dv se and my stereo
its not a ground loop, ive had this problem already and fixed it.
but that other disturbing noise is still there.