Thanks for your reply, unfortunately it didn't work.
Sorry i didnt make it clear i had already downloaded the latest drivers this morning, the only thing i hadn't done was to repair permissions.
I did the repair and managed to get the new screen i plugged in to fire up just briefly but then it went back to 3 screens and each screen would randomly flicker every couple of seconds. As each one flickered it would disappear from the display arrangement screen.
It seems not to like more than 1 USB adapter plugged in the same time.
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