GREEN AND PURPLE PIXEL DOTS ON IMAC 27 SCREEN!!

*little green and purple pixel dots on my imac27 screen._ The dots are not permanent on to a specific place they change randomly and ive got them on my screen 1-2 times per day 1-2 hours each time (not all the time).Does anyone knows whats happening?

Hi-
Have you applied both iMac 27" firmware fixes?
First, do this...
http://support.apple.com/kb/DL984
and then this...
http://support.apple.com/kb/DL998

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