I bought a brand new Nikon D750. I'm upgrading from a D3100, big jump, I know. I've shot in manual mode and alternated between auto focus and manual focus depending on the subject. I thought I wasn't an idiot or totally in the dark, though I knew I had a lot to learn; hence the upgrade.
But for some reason, I cannot change my focus mode. I'm using the button next to the AF/Manual switch. From the first time I turned it on it hasn't autofocused.
The lens I'm using is the AF-S Nikkor 50mm f/1.8G