Random Green Wallpaper Screen Appeared While Surfing the Net

So I was reading some news articles on chrome when all of a sudden my desktop wallpaper went a bright green color and all the desktop icons became hidden as well as the other windows I had open from other programs.  At first I was *** and instantly went to open a folder to make sure everything I had saved to my desktop still existed.  Next, I went googling my problem and after having no luck started shutting down programs.  After shutting down vlc my desktop returned to normal and the random green wallpaper disappeared.  Not quite sure what happened or what caused it to happen.  Wondering if I should be concerned about anything internally on my Imac. 
Thanks,
Christina

True that adding more RAM gives better performance in OS X.
If you watch the memory usage, either via Apple Activity Monitor (in the Applications Utilities folder) or other utility, you can see how much of your RAM is being used.
The free utility MemoryStick gives a quick summary of total RAM in use, and number of virtual memory swap files. <http://www.tidbits.com/matt/?@@>
I found that when I added more RAM, the number of VM swap files went down, and the waiting or slow responding of some of my applications (when I had many apps open simultaneously) went away.
Though I do not know if there will be much fan behavior changing.
You may want to try some of the reset processes - Resetting the PRAM, PMU (Power Management Unit) or SMU (System Management Unit).
This article explains some of that <http://docs.info.apple.com/article.html?artnum=2238>. I know the newer 2005 iMacs do a power/system reset by having the power cord unplugged from the back of the iMac, and leave off for 15 seconds, then replug into back. (not from wall, but from back of iMac itself). Not sure if that applies to your 2004 iMac G5 1.6GHz, but it is simple enough to give that a try, along with the usual reset of PRAM and possibly reset of NVRAM.
Looks like the 2004 iMac G5 reset their power with an internal button push. So best to try the PRAM resetting first>> press Command-Option-P-R keys when you start up, just after you hear the statup chime.
Continue to hold those keys until you get two more restarts, and hear two more chimes, then release.
If that doesn't seem to bring the fan revs down, you may need to do the internal PMU/SMU reset. Instructions here <http://docs.info.apple.com/article.html?artnum=301283>, step 11. But this involves taking the back cover off, so is a bit more involved.

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