The lens wont dtay on Nikon d40x - Nikon D40x Digital Camera

SOURCE: Nikon D40X camera and AF-S Nikkor lens 18-200mm will not autofocus

Try removing the lens and then reloading it.   Hope this works.

SOURCE: nikon d40x

That's because the Nikon D40x does not have Live View. Up until a couple of years ago, no DSLR's had live preview, due to the design of a DSLR over a point and shoot, as it has a pentamirror arrangement that effectivly deflects the light path to the viewfinder and only to the sensor when the internal mirror is raised. Early live preview models from Olympus had the world's first Live View system by flipping the mirror so that the picture preview could be seen on the rear monitor. Most manufacturers now incorporate Live View into most of their models but most Nikon consumer models do not as yet, apart from the newly relesed D90. The D40 and D40x are two year old designs and therefore do not have the more "modern" specs of say the Olympus E520 or Canon EOS450D. Most photographers trading up from a compact to a DSLR are surprised when they cannot use the monitor in the same way. However for most aspects of DSLR photography Live View is not something that is used all the time, low down shots, macro perhaps being the most convenient use, but for general photography there is no substitute for framing through the viewfinder, that's what we've been used to doing for over half a century! Besides as pointed out previously a DSLR is often too heavy to hand hold at arms length especially with a long lens.

SOURCE: Nikon d40x shutter stuck

The manual (pg 112) simply, and unfortunately, states this message "Press shutter release button again. If error persists, consult with Nikon-authorized service representative".

Some questions that might help: have you had the camera in some extreme conditions, damp, sand, etc. Clean the shutter button really well. Maybe use a small air blower and clean in the shutter release creases.

In the end, if the error continues, it will need to be serviced.

SOURCE: Nikon D40x indicate battary low

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SOURCE: My son dropped my Nikon D40x, cracking a piece of

Lenses are precision instruments and require specialist tools to fix. Have it repaired by a licensed technician. If it is the standard kit lens, just buy a new one. The repair costs may outway the price of a new one.