Camera focuses but won‘t take picture.

At first when i turn on the camera it takes automatically a picture. And than when i would like to take a picture, i press the shutter button half than it focuses but when i press it fully it wont take the picture. And it seems when i press the shutter button fully, that i press the Q button on the touch screen ( which i press to use the touch screen). But i can take pictures when i use the monitor.