Film rewind crank stuck in up position nikon n2000

The camera should operate perfectly fine without a lens. It should also operate perfectly fine without film (other than for not taking any pictures, of course).
I know this is stupid, but make sure the batteries are inserted in the proper direction. Then make sure the film advance mode selector around the shutter release button is not in the "L" position. L is for Lock, S is for single-frame, and C is for continuous.
If you need a manual you may download a copy here.

Have you rewound the film? If you rewind the file completely and pull out the rewind know, it will pop the back open . . . and can remove the film cassette. While the back is still open, complete the cycle on the winding crank. The winding crank should return to "Normal" arter you complete the winding cycle. When you close the back, everything should go back to normal.

Rather than try to describe the process, I'll refer you to the illustrated instructions in the manual you can download from
http://butkus.org/chinon/nikon/nikon_n2000/nikon_n2000.htm

If by manual you mean turning a crank to rewind the film, no. If you mean to do it at a point other than the end of the roll, yes.

To rewind film mid-roll, press the two film rewind buttons simultaneously for approximately one second. The film will then rewind and the frame counter will count backward. The film is completely rewound when the E appears in place of the frame number.

The two film rewind buttons are marked with a red film canister symbol with left-pointing arrows. One is the exposure compensation button next to the control panel, the other is the self-timer button next to the mode dial.

If you need a manual, you can download one from
http://butkus.org/chinon/nikon/nikon_n65/nikon_n65.htm

Set the film advance mode selector to L.

While sliding film rewind lever, push film rewind button.

Fold out film rewind crank and rotate until film advance indicator stops moving.

If you don't have a manual, you can download one from http://www.butkus.org/chinon/nikon.htm

Is it an SLR model?

I am not familiar with Nikons; however, Minolta and Canon SLR film camera's film compartments are opened by lifting up on the film rewind mechanism on the top left side of the camera.

If the Nikons are designed like Minolta and Canon, there will be a small tab to push in at the bottom of the camera. This releases the film and allows it to be rewound. At the top left will be a small rewind lever that is used to do the rewind. The part of the camera that the rewind lever is attached to is pulled up to open the back of the camera.

The rewind switch is stuck. You will need to replace it or remove & clean it. replacing it is easier to do than tearing apart for they break so easily

Hey mikki1,
One reason this might be happening is the multiple exposure lever is stuck to the select position which would not allow the film to advance. I hope this helps!

Sincerely,
Allan
Go Ahead. Use Us.

First check the batteries. Are they fully charged? If you still have the same problem, try this:

Is the film (that which did not rewind fully) still in the camera? If so, open the film chamber door once in a dark room and close it again. Try to rewind the film again. This could possibly be the result of the film getting stuck somewhere, preventing the camera from rewinding it.

Most manual cameras have a button to release the film on the bottom of the camera, push the button in and turn the rewind crank (left side of the top of the camera) until you feel the crank suddenly turning much easier.