hum noise

When I use the 3.5mm audio out on my HP 15 laptop and the video out from HDMI at the same time, I get an audible buzz or hum noise. What can I do to fix this? I'm outputting audio to a set of speakers.

Hi everyone, My Amplifier system gives a High pitch static noise while I play something from Computer but not from my phone. Then I switched the Power supply (ATX PSU) of my Amplifier to a normal power 12v 700mA Adapter. The noise GONE!! This noise was created by SMPS Power supply 12v 15A (ATX...

Hey I put this in CPU because i have no idea where it belongs. So a few days ago my computer started making a strange humming noise that went louder and quieter in rythm, I opened my case and tried to clean out all the dust i could find. The hum is still there but now its more constant instead...

Hello! So my PC is kind of a buggy mess with weird [Profanity edited out] and i was trying to fix some sound issues i was having on my headsets. I will name them H1 , H2 and H3 for simplicity sake. I was playing with my friends in discord using H1 and suddenly the mic started huming and...

Hey, So I got computer problems buzzing humming noises thats gives my KRK Rokit 5 G4 through Focusrite Scarlett 4i4 3rd gen. The noise disappears when I connect it to my laptop... but on my PC Windows 10 the noise comes back feels like its coming from cpu or usb ports? tried them all the same...