Imac annoying popping sounds

My Imac has recently started to present annoyng popping sounds whenever i listen to anything: from a track in itunes to a video in youtube. It's totally random. It usually presents itself after I'm hearing to something for about 30 minutes. After that it will become non-stop unless I myself stop the playback.
This is very annoying and I can't find a solution even if I've found precedents treads about similar problems.

I dont have an advice but I'd like to share a problem of mine. I am experiencing a continuous sound/hum sort of noise from my 20" ACD. I checked the power adapter and did a lot of troubleshooting (almost same as you did) but nothing happened. The sound is pretty much consistent. But you know, when I switch off my display during normal operation the sound vanishes. Tried this a hundred tiimes and finally confirmed that yes, its probably the inverter board inside the LCD panel which normally produces 2000Volts and sometimes produces popping or consistent sounds. So the only advice is, get rid of it.

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