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My dell u2711 display has a sort of sync problem on the right half

The right half of the image moves a little bit to the left (something about 5mm) for just an instant. Problem occurs randomly : sometimes 2 or 3 in 1 minute ; sometimes 1 in 30 minutes tested 2 different graphic cards, 2 different dvi cable, and different refresh rates. I know u2711 display uses 2 chip to process the high definition. One for the half left and 1 for the right so it explains why a lot of problem concerns only one half of the display. Thanks in advance for an idea ...

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