The solution to your problem could be user error, a calibration issue, or like you said a part failure. If I were you, I would first try approaching the object you are photographing from a different angle or position. There might be too much going on in the background for the autofocus to find something to zone in on. If this doesn't work, you should then try calibrating your camera lens. Nikon calls this process "AF Fine tune" and you can purchase a tuning kit or do a DIY calibration. Calibration kit DIY Method If that doesn't work, you may have to replace the focus motor. Refer to the troubleshooting page for the steps to replace this part. WARNING: Replacing components on this camera is not an easy task and it requires a good amount of time and patience to do it correctly. There are many components and wire connections through out that will need to be re-soldered if you are not careful. Make sure you remove the battery and that the flash capacitor is discharged as it will hold charge even after the...

This model unfortunately does not have built in WiFi as it is an entry level D-SLR. However, you can purchase an external wireless adapter from Nikon that plugs into the mini-USB port on the left hand side of the camera. http://www.nikonusa.com/en/nikon-products/product/wireless/wu-1a-wireless-mobile-adapter.html