Late 2012 27" iMac Shuts Down On Its Own?

Over the last week I have been experiencing random power outages on my iMac. These outages would occur typically while I'm playing games (FIFA 15, GTA V) on my Windows 8 partition via Bootcamp. These games are being played within graphics card limitations and do not have any running issues. Although, the power outages can be predicted if the game begins to suffer framerate issues.
It has occurred twice while using Yosemite OSX as well.
Once the power is out, the iMac won't restart unless I remove the plug and put it back in the power outlet. I am using a good quality power surge protector, and I have alternated between wall outlets and surge protectors. The issue has persisted regardless of this.
What can be done in order to fix my issue? Is there a hardware issue?

Thank you for your help. I still did not find an issue and moved over to the Bootcamp section of the forum to address my concerns.
Power Issue When Running Games On Windows

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