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Original post by: Max El ,

Text:

I HAD the same problem. After some research I found the following solution that worked in my case.

Quote: "I did a lot of searching around but ended up finding the solution by accident. The problem, it turns out, didn't have anything to do with my screen. It was a fluorescent lamp plugged in to the same circuit as my computer. It was actually on the other side of the room but it creates interference in the AC power that conflicts with the power supply in the computer. Somewhat similar to what makes some car stereos buzz when driving."

Ergo: I changed all the fluorescent lamps in my room with LEDs >>  buzzy noise fixed.

original solution see this link: https://discussions.apple.com/thread/3433824?tstart=0

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open