Problems with the brightness of my 27" inchs i7 iMac (2009)

The brightness isn't as high as it should, I see the screen fluttering few times to a lower brightness. Usually, when I turn on my computer the bright is ok, but immediately it goes lower and flutter randomly.
Note: I have Windows 7 64bits running on Bootcamp too but uses more frequently Mac Os. Don't know if that matters.

AFAIK, not the new ones (OWC even took their notes re. internal iMac drives off as well as their install instructions) due to some cabling (I believe):

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