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I've tried cards, lenses, etc, but it all does the same thing. If I take a couple pictures it freezes up and won't shut off till I pull the battery. It seems that it has something to do with playback/liveview.  I let the camera sit for a week, and photos worked fine, but trying video messed it all up again. So it may very well be hardware.

Hey I have the same thing happening. I was recording a video and then it just stopped, so I turned it off, switched cards, and now everytime I try to take video or take too many pics it does that ^  the only difference is mines a t2i.  I've tried reinstalling the firmware/ML...