Problem monitor or setting fault?

Do you have Dynamic contrast or something enabled?
'Adaptive Contrast'. Solved now it's off. Thanks

New or used?
Neither - returned by a buyer because of 'a scratch'. Bought for a discount at £600. Just trying to work out if its worth keeping. Horizontal scan lines appear when overclocked though at 85Hz it's very hard to spot. Still a nice improvement from 60Hz...
 
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