Hi,
This has happened to my XT-3 now. Worked fine a week ago then placed in a camera bag with a good battery. Picked it up yesterday and it is a paper weight. Tried swapping out the battery, the cards and the lens all to no avail. Cleaned the contacts ( camera and battery ) and checked the spring in the contacts. Camera still completely dead. Connected it via SUB-C to a computer whilst watching the USB log file and nothing / unresponsive. It is not the viewfinder selection setting. It appears to be a complete failure of the camera to boot or respond in any way.
No warranty on the camera now. Am waiting for a reply to an email to fuji UK.
Most disappointing.
Cheers,
F