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Ok, I assume you're running at 60hz?
There's two options in the ATI control panel called 'Reduce DVI frequency on high-resolution displays' and 'Alternate DVI operation mode', you could try enabling/disabling them to see if they help.
Try connecting the monitor to a friend's computer or borrow a graphics card from someone to rule out a problem with the card.
Ultimately, the electronics driving the panel can be fucked, in wich case you'll need to take the monitor back and get a new one.
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