Noise on K7N420.

Has anyone experienced this? I am using analog stereo output of nForce on-board audio and I get a hissing sound on my Creative 2.1 analog speakers when I turn the volume all the way up. It's not there when I pull the speakers out from the jack so it's not the speaker. What could be causing this?
MSI K7N420
1.6 Athlon XP
2x128MB PQI DDR SDRAM
GeFORCE 2 GTS 32MB
Pioneer DVD 105S
XP Pro/Mandrake 9 Beta 4

well make sure line in, is muted. it makes nouse
but the power from the computer has a slight umm power to it...
so when you crank it all the way up.. your amplifying the slight buzz of power.
thats why disconecting it from the computer stops it..
its a anilog singnal.. your always going to get a slight buz from them..
thats why digital's geting more popular.. it is clearer
i use digital the only buz i get is from the amp in the speakers..
its the same amount of buz i get from my monitor's being on...
i notest the difrence when a monitor is on or off...  power make's noise.

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