My 27' iMac goes dim for a few minutes on highest brightness

My 27' 2011 model iMac goes dim for a few minutes on highest brightness setting then returns, and brifely flickers very faintly for a split second at a time, its driving me crazy, never downloaded anything i shouldnt of, its plugs are all securley in place and it still has tons of memory space left in it. anyone help

Hello,
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.5, 10.6, 10.7 & 10.8…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x/10.8.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
f using Wifi/Airport...
Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
For 10.5/10.6/10.7/10.8, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
208.67.222.222
208.67.220.220
(There may be better or faster DNS numbers in your area, but these should be a good test).
Click OK.

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    Hello,
    Make a New Location, Using network locations in Mac OS X ...
    http://support.apple.com/kb/HT2712
    10.5, 10.6, 10.7 & 10.8…
    System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
    10.5.x/10.6.x/10.7.x/10.8.x instructions...
    System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
    The interface that connects to the Internet should be dragged to the top of the list.
    f using Wifi/Airport...
    Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
    For 10.5/10.6/10.7/10.8, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
    208.67.222.222
    208.67.220.220
    (There may be better or faster DNS numbers in your area, but these should be a good test).
    Click OK.

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