I am getting green and purple dots

I am getting green and purple dots. When I click on icon with video for file info on my 27inch IMAC G5 Quad Intel. Dots are all over the screen. When I grab a window around the screen these tiny green-purple dots and they disappear.

Hello,
Have you blown the dust out lately?
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
iStat Menus...
http://bjango.com/mac/istatmenus/
And/or iStat Pro...
http://www.islayer.com/apps/istatpro/
BTW, no G5, those were IBM CPUs, yours is Intel i5.

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