Corrupted graphics, red/blue artifacts

I was playing Dragon Age 2 and suddenly these small red squares started showing up on screen.  Tried restarting the game and it didn't help.  Found out my hard drive was failing and took it to the apple store for a replacement.  I assumed hard drive was causing the problems, but now with a brand new hard drive and a fresh install the artifacts are still there.  Now they also show up on Starcraft 2, but there are larger blue squares as well.  I've tried lowering the graphics settings on both games and while this helps, I was able to play both games with near maxed graphics for months with no issues.  Seems strange that suddenly I have to play on low settings to avoid the artifacts. 
2.93 GHz quad core, 12GB RAM, 1GB VRAM (ATI Radeon HD 5750)

I would suggest visiting the Apple Store Genius Bar. Bring your iMac and play the game in front of a Genius, they might be able to figure out what's happening with your computer. Also, run the Apple Hardware Test and write any error code that it provides during the testing.
Click Here to learn more about the Apple Hardware Test.
http://support.apple.com/kb/ht1509
Good Luck!

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