Why Is My 27" iMac Showing Random Moving Dots

My Imac Is Showing Random Moving Flashing Dots On the screen any help is great here is a screenshot link https://www.dropbox.com/s/4857q93vf09r4mo/Screen%20Shot%202013-04-17%20at%2011.0 5.38%20AM.png

It's could be a sign of an overheating iMac.
When was the last time you vacuumed out all of the vents slots and ports around your iMac?
You have tp power down your iMac, disconnect everything and unplug your iMac.
Use either a small electronics vacuum or a standard vacuum with hose and crevice tool attachment and slowly and carefully vacuum out all of the various vents, slots and ports around your iMac.
Then, reconnect everything, startup your iMac. Download and install iStat Pro temperature monitor and report your iMac's temperatures here.

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