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I have 3 VideoSeven screens running off to identical PCiE cards, and I have just noticed that they all have the same mark which looks like the old burn marks you used to get on CRT monitors. All in the same place and all a white streak that only appears when a dialogue box with a white ground is moved across the place where the marks are present (a 1/4" wide mark about 2" down on the left hand side and stretching half way across the screen to nothing). It looks vaguely like the mark left by the last dialogue box that was there.
any ideas anyone? Changing the refresh rate only makes it worse, the drivers are the latest.

Throw them away and buy new ones?

well you can see if its the computer doing it or not by hooking the screens up to a diff video source

It is not the screens nor the cards. Nvidia are pretty useless too. It does seem to get worse the longer the system is running and it looks like an echo of the frame of the dialogue box that is always open (email) being repeated across all screens.

could be a faulty NVIDIA chip- they are having recall issues now. BTW - graphics issues are covered in the audio/video forum.

OK - I'll close this now as it started as a hardware issue which proved to be wrong. Will have a go at Nvidia.