Dark area pixel flickering

Ever since I bought my iMac it has occasionally had a weird flikering in dark areas on the screen. It has happened in quicktime videos, iPhoto, Photoshop and sometimes on just the desktop background.
Some of the pixels sparkle green, red and yellow. Twice its happened in the last few days, but it seems rather random and usually long between occurances.
I posted in the below topic about this time last year, a few people said it was the logic board, but the last poster stated the problem persisted even after replacing the logic board.
http://discussions.apple.com/thread.jspa?messageID=976131&#976131
Is anyone else still experiencing this, any idea why, or what a cure may be?
iMac 20" 2ghz revB   Mac OS X (10.4)  

I have had white pixel flashing for months now, it only happens when the monitor has been off and is woken up. Usually only lasts about 1-3 minutes until the monitor seems to be "warmed" up, very odd but nothing else is wrong so I haven't called Apple. This is on a Rev 3 iSight also. Does this happen to you after the monitor has been on for a while? I am thinking it has something to do with the screen not being at full operating temp.

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