For fear of stating the obvious, is it *definitely* not turning on? I had a similar situation where I thought it wasn't turning on, but I had just inadvertently pressed the 'view mode' button (to the right of the EVF) with the effect of switching off the LCD; since then I keep it mainly in 'EVF only + eye sensor' mode. Again apologies if this is an exercise in teaching granny how to suck eggs, but sometimes the obvious can be overlooked.