Hissing noise from logitech z506

May 8, 2018
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Hi.i recently switched from gigabyte z270 gaming k5 to asus rog maximus x hero.i have z506 speakers form Logitech and when i turn off the PC it will start the hissing sound.by removing the front speakers cable from the motherboard i/o panel it will be perfectly fine.but even when i remove the power plug the noise remains.i haven't had this issue with the gigabyte board.any ideas whats going on here?!
 

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