IMac 21.5" 2010 Intel having screen problems - Apple store no help

Hi -
So I've been reading on this board about the problems people have been having with the iMac displays going haywire - flickering and then going black... I've had my 21.5" iMac for about 10 months now and have started to have this problem, albeit intermittently.  I've been to the Apple Store twice (and of course, the screen performs fine in the store) - the first time they ran "12 hours of diagnostic testing" and found nothing wrong.  The second time, the "Genius" installed the new version of Flash and suggested seeing if it mattered what was plugged into the Firewire/USB ports that caused it to flicker.  I can find no one thing that I have done consistently that causes the display to begin behaving this way.  Today I did nothing but check my Gmail (had nothing plugged in the back) and it started flickering and going to a black screen continuously.  I have certainly lost faith in my local Apple Store to fix this problem... from what I've researched here it seems that my iMac needs a new display or backlight.  Does anyone have any suggestions about what to do? Or what to do or say when/IF I go into the Apple Store again with this?  I'm kind of at the end of my rope here.
Thanks and sorry if this subject has been beaten to death,
JB

Hi Jb,
Is it maybe plugged into a UPS at home?
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/
Can you rest it long enough without Ethernet, external FW & USB devices to tell?

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