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Speakers connected to a desktop PC give a constant low hum that disappears when the PC's audio cable is unplugged, and changes when the monitor is plugged into a different socket. What is the likely cause?

Des haut-parleurs branchés sur un PC de bureau émettent un bourdonnement grave constant qui disparaît lorsqu'on débranche le câble audio du PC, et qui change lorsque l'écran est branché sur une autre prise. Quelle est la cause probable ?

Answers
AA ground loop between devices on different power pointsUne boucle de masse entre des appareils branchés sur des prises différentes
BA virus playing a hidden sound file in the backgroundUn virus qui joue un fichier sonore caché en arrière-plan
CThe speaker volume is set exactly to 50%Le volume des haut-parleurs est réglé exactement à 50 %
DThe sound driver is out of dateLe pilote audio n'est pas à jour
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