Flash Video in full screen system failure

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http://askubuntu.com – I have recently reinstalled Ubuntu 12.04 and replaced hard drives and video cards (both nvidia) but changed drivers as I went from a 7600gt with the 173 driver to GT 640 with 310 driver. I had some success before (only HD videos would cause this issue) and now it is easily repeatable for me regardless of other circumstances. Open browser of choice (tested Opera, Chromium, Firefox, Chrome) to flash content Play flash content in full screen Watch PC shut off from failure I can play Team Fortress 2 in HD 1080p. I can watch 1080p content from enormous MKV files or HTML5 from Youtube. I can pla (HowTos)