So this morning I decide I'll try to get some early morning sun shots out in the back yard. Our wall in back is 6ft high so by the time the sun comes up over it, it really isn't all that 'early'. Anyway, I grab the camera, check that it's got a card, battery and the lens info is set for the anti-shake. Check, check and check. Go out, turn the camera ON, frame a shot, press the shutter button, and nothing happens. ....Try again. Still nothing. Focus peaking is working, speed changes are effecting the exposure as I'd expect them to. Try again. Nothing. Retreat back into the house so I can put my glasses on AND read the screen as you can't see it in the broad daylight (at least I can't). Go thru all my checks again. Everything checks out OK. Press the shutter...and then I notice that the 10-sec self-timer light is lighting up. I have the sound turned off. Guess I should turn it back ON. I admit, I almost, almost panicked when nothing happened outside, but knew it had to be user error. I'd left the self timer on when recording the shutter sound videos. All's well now. Carry on.