IMac screen suddenly oversaturated. ML. Redish-magenta colors

I have my osx system since 2007. i recently upgraded to imac 2012, 21.5" and Mountain Lion  (from imac 2007, snow leopard). I do professional photography.
Everything was fine until i notice that in some photos, my magenta-redishh colors were way to saturated. I DO food photography, speccially salmon and this particular salmon hue is very  very saturated now.
Also i notice an increased "GAMMA" compared to my previous monitor, but i was expecting that on new imacs. Any way, this gamma enhancement increases overall contrast too making everything worst.
Tried to change the monitor profile (i´m using thedefault by now) and nothing changes. Is very annoying not having fine control over the iMac screen. The visual callibration method is very unreliable. I did not touch the "universal acces" contrast either, that is not the issue.
I´ll try to load in safe mode, maybe is there a nvidia CUDA driver error?
Please i need help .i´m afraid is a hardware issue.
thanks.

I downloaded the whacked rgb image and it looks ok for me. on every app. a little oversaturated overall
only color-managed apps will display whackedRGB correctly -- it will look blue on unmanaged apps
if it is still showing a little oversaturated in Preview, Photoshop, Safari -- then your monitor profile doesn't quite match your monitor
you might try using a fresh sRGB profile as your monitor profile (if that improves the WhackedRGB color) until you get the calibration figured out
untagged and adobe rgb look more saturated on orange-magenta hue.
untagged RGB on unmanaged apps generally gets sent straight to the monitor with no change
you can test this in Photoshop by View> Proof Setup: Monitor RGB
untagged RGB on color-managed apps (Safari, Preview) generally gets sent straight to the monitor with no change
untagged RGB on Photoshop (you ignore the embedded profile or don't color manage) and Firefox (with Full Color Management Value 1 enabled), for all practical purposes, ASSIGNS the working default profile and CONVERTS to monitor RGB

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