One Month Old Imac Display Bleached out

The Imac is one month old, base model upgraded to 8Gb RAM. Not running anything too heavy. Recently the display became 'bleached out', for example I cannot see the black lines between columns on the Finder, and the icons seems washed out. in addition I cannot connect a second display as when I press detect displays, none are detected. I have done the usual resets and run an online hard ware test, nothing has changed and the ahrdware is running normally apparently. Have you any sugegstions please as to how to return things back to normal?
Thanks
Mike
PS also recalibrated the monitor but again no change

Hi
I had the same problem and found the answer here :
https://discussions.apple.com/thread/602429?start=0&tstart=0
Which suggested this :
System Preferences > Universal Access > Seeing > look near the bottom, there should be a Contrast adjustment slide, all the way left is normal...
Worked great for me - not sure how it was adjusted in the first place, but all is well now.

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