Logitech X-240 seems love to pickup all RF noise.
Any AM [amplitude modulation] over such RF gets into audio as another noise - some might pick up AM radio signal although won't sound clear at all with some amplifiers [I am serious] - which has high gain preamps - less shielding and unmanaged ground wire handling.
Re-engineer with shilded cable - and [I don't know how normal users will do] - make sure the docking part is not the RF picker.
Well, when your CPU is processing millions of transistors are switching, and we call that digital noise, usually systems with high SNR {signal to noise ratio} should be more immune to such.
One more thing, it could be just the audio card [be it plugged in PCI bus or in Motherboard] could be a bad one - which is picking up noise - rearrange all cables inside CPU box - and check.
Isolate the problem - if it is from CPU, and audio-card --> audio line-out amp chip is picking the noise, - unplud the card or swap with another good audio card, possibly different make/model.
If the audio is on motherboard - do disable through BIOS setup.
have you tried this control panel sounds and audio,volume,advanced,speakers select the appropriate speakers from the drop down list or click start control panel administrive tools computer management device manager scroll to system devices + to expand,system speaker right click properties then select use this device (enable)
try cleaning your computer of dust using a fine air blower from a compressor making VERY sure that there is no MOISTURE in the air line specifically around the CPU central processing unit and your sound card dust causes static to build up in a computer causing it to overheat any many other problems
hope this helps
don
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