I am sure I saw something like this one with my 600D. I was frantically trying to sort out what was going on and I think it was something like the camera whilst connected via USB shutdown after period of inactivity then I could not get it to turn back on while it was still connected to the USB, had to unplug it and turn it back on and reconnect it. I'm sure it was something along those lines, wonder if that was the same sort of thing you had?
Could you power yours back up at all afterwards?
Let us know what Canon come back to you with.
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