IMac powers off during DVD playback, why?

Right now, since the last update and my Applestore repair, by iMac powers off everytime I watch a DVD. Doesn't matter which player, I've tried Front Row, DVD Player, VLC, and Realplayer. It will play for 30seconds - 5minutes, and then power off. No error message.
My drive completely failed a few weeks ago, so I brought it to the Apple Store. They held it hostage for over a week and replaced the drive, the drive cable, and the "smart board" or whatever they called it. Upon return the drive works as expected... except this issue.
I run my business from my Mac so I want to make sure there isn't a simple way to fix this before I go back into the Apple Store (1 hour away).
Any ideas??
-Garrett

Hi, cannot tell you why..call AppleHelp (USA 1-800-275-2273)....L

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I know 750w is sufficient for a 770 but does it have enough amps on the 12v rail?
http://www.morele.net/zasilacz-ocz-zt-series-750w-fully-modular-80-plus-bronze-atx12v-v2-2-active-pfc-ocz-zt750w-eu-433644/
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341052
Take it?
Quote from: sew333 on 07-November-13, 23:43:50
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IMac powers off during DVD playback, why?

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