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Message: <blockquote data-quote="Federico Bringeri" data-source="post: 105331" data-attributes="member: 12525">Hello,I have bought a D3100 with the standard 18-55 mm lens about 2 years ago. From one day to the other, the auto-focusing stopped working all together and does not allow me to even take the picture. Only when I switch the selector to M for the manual focus I am able to take a picture.I have swapped the lens with a friend who has the same camera and it does works therefore it is not the camera. The lens does not appear to have any physical damage nor it has fallen, is there a reason why all of a sudden it has stopped working?Thank you for your help!</blockquote>