Imac Flashing blue screen

23" iMac from 08 or 09 suddenly started flashing a blue screen in early January. Took it into to the apple store they said they couldn't emulate the problem but they did some software updates "so hopefully that fixed the problem". It didn't. I ended taking it again, still they couldn't find the problem. I really frustrated now. Here are the things that I've tried on my own:
I updated all my software and reset permissions.
I used chrome, but at the apple store while running test they only used Safari. SO I thought Chrome might be the problem. I un-installed it. But still have the same issue.
I also noticed at the apple store they use their own power cord, I knew it might be a long shot but I bought a new power cord, didn't work.
Ive completely cleared and re-installed the operating system and didn't put any of my old file or programs on it thinking they might be the culprits, but no still flashing blue.
I've tried looking through post with other people that have the a similar issue, but they all seem to be connected to an external monitor which I do not have.

My Apple care just expired in February but I'm in contact with apple trying to figure something out since I took the computer to them twice before it expired but they couldn't figure it out.
I don't understand why at home it flashes like crazy but at the store it's fine. I downloaded the istat program, I'm not really sure what is normal but I feel like the room where I keep my computer is relativley cool and I don't think that's the problem. Here are the stats on my computer it has been running for about an hour with video running in the background while I browse the web (and yes it is currently flashing):
After doing some more research I also think It has to be the graphics cards, i'll talk to apple about it this weekend and see what I can do.
Thanks for the help guys! and sorry for all the typos in my first post, yikes!

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ONE
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TWO
Then re-install your old programs (only those you really need since they are likely PowerPC, not “universal” Intel programs) from their original disks.
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If you have the user data from the old drive backed up, then hopefully you can restore your user data to the new drive or buy an enclosure and access the old data as needed (which is what I did when originally migrating from a Power Mac G5 to the iMac (late 2009).
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{------------ Please click the "White Kudos" Thumbs Up to say THANKS for helping.
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