My Imac shuts off when watching videos, and also when trying to edit videos.  The fan(s) turn on, then a short time later it just shuts off.

I have the latest OS update from Apple that I had to buy - 10.8.2. 
The fans come on, then the machine shuts down.  I have 4GB RAM, it can go up to 8GB.  I was editing GoPro videos when it started, now it seems to happen all the time, even when watching a Youtube video in a small window.  It doesn't happen when just using e-mail or visiting forums.
This was happening before the upgrade as well; I got the upgrade so I could iCloud with my wife's iPad.
Do I need a new fan?  More RAM?
There is a install sheet for the RAM, but how do I check if the fan(s) are OK?  I hear it/them blowing even as I type this.
TIA!
Mike

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/
What are the hi temps?

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