The first owner had bought another body, because this one did'nt release the shutter; it was in the back of the storeroom, and with me, it worked without any problem. So the photographer told me to put it with my belongings, to make room. I never had to do any repairing on it. The 45mm lens is also a gift from one customer, but I do not remember who; at the beginning, I used it with the 28-80mm Tamron.
Ubelieveable! even a professionnal photographer who doesn't know that some cameras cannot work without batteries! He tried anything, shaking it, knocking on it... And when I settled two LR44 batteries, he didn't believe it could work!It works!
The shutter does not work. But the winder can be used on one of the other X300...
Edit November 2018: It is repaired, I only had to replace a capacitor under the sole. Thanks to Gerard who provided the explanation ... and the capacitor.