Depends what he was doing just before this happened, e.g. loading a map, updating fw....
Have a look at these threads: [Only registered and activated users can see links. ], and: [Only registered and activated users can see links. ], but you need to get into pre-boot mode to use them. Try another usb cable and read the entire threads regarding accessing pre-boot mode also look here: [Only registered and activated users can see links. ] and here: [Only registered and activated users can see links. ].
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