Maybe it has already been said before, I couldn't find it in the other threads. I haven't experienced it myself but if you could try the following:
Since the gfx card is responsible for the "refresh-rate" of the screen. It will draw the screen again and again with usually 60Hz or more. Now, with the most newer screens being TFT/LCD this refreh rate isn't needed as the TFT/LCD displays use a different refresh-system.
One might try to increase/decrease the refresh-rate of the card to see if it helps.
I hope it does, other than that, squeeling is usually produced by a coil or Opamp which is resonating due to some kind of feedback or frequency.
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