Frozen with grey and black stripes

While working on my 2011 imac today, the screen suddenly changed to be covered by grey and black striped and froze.  I eventually turned the computer off by holding down the power button. It turned back on and seems to be working fine.  Flash was crashing a bunch earlier in the day and I seemed to be having trouble uploading a ppt presentation, but otherwise everything was working fine.
I want to figure out what's going on. Ideas?

See if the Disk is issuing any S.M.A.R.T errors in Disk Utility...
http://support.apple.com/kb/PH7029
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/

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