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I have a Rewfurbished HP EliteDesk 800 G5 SFF.

My configuration: 

2 x nvme SSD  of 2TB each (nes)

1 x SATA 500GB HD

16 GB RAM (1 x DDR4)

Nvidia Quadro K620

OS Linux mint

When I do some actions on the PC (open a program or open a Web Browser, etc..) I get a pitched humming noise coming from inside the PC. It's very low noise not annoying me but if I connect an external speaker powered from an EliteDesk USB Type A I hear the noise in the Speakers. If I plug the speakers using a Cellphone USB charger (plugged in the main power supply) I have no noise on the speakers but only the low noise inside the PC. 

I think is something about noise on the power supply.

if it's not a problem that leads to the PC breaking I can live with it, but since I just purchased the PC I don't want to have to replace it in a few months

 

Gian Carlo

 

 

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