Electrical noise when a white background is displayed on the screen

My iMac 27 mid-2010 got the LCD and graphics card replaced recently, due to the infamous dark spots on the display and some other video problems (vertical dotted lines on the screen).
Those issues are fixed, but now I have a new problem that didn't exist before the repair:
There is an annoying high-pitched electrical noise, but only when a white background is displayed on the screen. For example: When I open a blank page in Safari, the noise comes up. If I switch to another tab with a black background web page, the noise disappears.
The noise is perfectly noticeable, and very annoying, when using the computer in a silent room. It is not related to display brightness, since it's always there no matter what brightness level I set.
The Genius in the local Apple Store was able to hear it, so it's not a problem of perception. But he could neither find the cause nor solve the issue, so he returned the computer to me, with a vague 'its a normal noise, maybe caused by the CPU or the graphics card when they have to display white backgrounds'.
Well, the thing is, this noise wasn't there before the LCD/graphics card replacement. I'm pretty sure about it, since I have been using this computer in a daily basis for the past two years and I know each and every noise that comes out of it.
I would like to ask if any of you know of this problem. I've done a lot of searching in the internet, but couldn't find anything about this noise in particular.
Thanks,
Miguel

Hi, thanks for your suggestion.
Unfortunately, they have made up their mind about this issue. I even talked to the Store Manager, asking for a solution, but he pretty much ignored me saying he had full confidence in his team: if the genius says the noise is 'normal', then there's nothing more to discuss. Full stop.
They just replaced a fan, which didn't solve anything, because the noise is clearly electrical in nature, NOT mechanical. I suspect it's related to capacitor resonance in the graphics card. The display and LED backlight panel seem to be OK, since the noise is not heard when I use the mac in target display mode via the mini-displayport input.
I gave them this information in order to help with the diagnosis, but they didn't even bother to write it down.
So far, the Apple Technical service seems very un-professional to me. I'm stuck with a defective computer for which I've paid 2.000 euros + Apple Care.
Well, in this case, Apple doesn't Care at all. I can't even find an email address where I can submit a written formal complain.
(Sorry for the rant)

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Electrical noise when a white background is displayed on the screen

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