Why do I get a loud hum when adjusting the screen brightness?

I am getting an annoying Hum and the loudness depends on the how bright I have the screen, as I turn it down the hum becomes quieter.  This is super distracting as I like to run my sound through external speakers, but the hum is just enhanced.  I brough my unit it for service, they sent it out and said nothing was wrong with it.... Any ideas?  None of my other computers make this hum!

Sounds like the inverter, which powers the screen is going bad. I'd bring it back.

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