Video Monitor Emitting High Pitch Whine

Hey!!

I just purchased a Gateway 21 Inch wide screen video monitor for my PC System. It is emitting an annoying high pitch whine from the back of the monitor. If I adjust the Darkness level downward, the whine gets lower in tone and louder. If I increase it to maximum, it becomes high pitched and quieter, but still there.

I spoke with Gateway. They were polite but clueless.

I tried a PS Audio Humbuster, but it did not stop the noise (It did improve the picture, btw).

Any other suggestions? Please help!!!

Brad