60 Hz mains hum on audio output after silent for a minute or so?

[adub86]

So my install was successful, running ML on a GA-7ZZN-WIFI with core i5 and a GTX 650 Ti Boost.

However, I have noticed that whenever there is nothing on my machine producing audio (i.e. so nothing going out on the audio output) - no system sounds, no music, nothing - for maybe thirty seconds or a minute (haven't timed it) I will start getting a buzzing on the line.

Sounds like it's your basic 60 Hz mains hum, but it only kicks in after a while like I said. So maybe the machine is actively putting out a zero signal but then when there's no output for a while it stops and the interference is heard on the line?

Anybody experienced this? Is this an issue with the audio driver? It's really annoying.

 

[toleda]

I will start getting a buzzing on the line.

Specific to your system. Inspect grounding, remove peripherals, check cables, change ports, etc.

 

[idreadful]

Sounds like it's your basic 60 Hz mains hum, but it only kicks in after a while like I said. So maybe the machine is actively putting out a zero signal but then when there's no output for a while it stops and the interference is heard on the line?

Are you using external sound amplifier?