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Any sign of possible condensation at the time?
I've seen similar behaviour with other cameras. Taking out the batteries and memory cards and leaving the camera for 5min fixed them. The mirror being down seems to indicate there was an error the camera encountered (it will flick it back and drop out of live view). The error might get "held" in memory while there is enough power left internally.
You could also take out the battery/memory card and remove the lens and take a good sniff into all the holes you can and see if you can smell anything burnt, get a torch too and look as best you can for scorch marks.
Very probable though the USB is the cause. Voltage levels on USB ports, especially laptops, tend to be dodgy and the crappy USB cables most devices come with (which means everybody is using them) often make flaky connections with ports and the connectors are poorly connected to the wiring of the cable. So it may have sent a spike into the camera if the camera/cable/laptop was moved slightly. USB damage I've seen with devices tends to be limited to the serial circuit close to the port so if there is damage it should be isolated, and the sensor is safe. But if its the case they'll have to replace the entire board the USB is a part of, they won't just replace the damaged component.
Hope its something trivial.
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