Getting a black screen when i look through the viewfinder. i could see clearly through it this morning. also, i am unable to rotate the shutter speed dial. it only rotates from 0 to +2. what do i do?

Is the lens cover opening ?

The screen will turn off if you put your eye close to the viewfinder as it has a sensor to stop light intruding on your vision through the viewfinder.

Rotate the Live View switch located just above the circular multiselector.

Full details are in the "Live View" section of the manual (beginning on page 37 in my copy).

A stuck shutter is another common failure mode for digital cameras. The symptoms of a stuck or "sticky" shutter are very similar to CCD image sensor failure. The camera may take black pictures (for shutter stuck closed), or the pictures may be very bright and overexposed, sometimes with lines, especially when taken outdoors (for shutter stuck open). To confirm a stuck shutter, put the camera in any mode other than "Auto", and turn the flash OFF (you don't want to blind yourself for the next step). Next look down the lens and take a picture. You should see a tiny flicker in the center of the lens as the shutter opens and closes. If no movement is seen, then you likely have a stuck shutter. If so, please see this link for further info and a simple fix that may help.

A stuck shutter is another common failure mode for digital cameras. The symptoms of a stuck or "sticky" shutter are very similar to CCD image sensor failure. The camera may take black pictures (for shutter stuck closed), or the pictures may be very bright and overexposed, sometimes with lines, especially when taken outdoors (for shutter stuck open). To confirm a stuck shutter, put the camera in any mode other than "Auto", and turn the flash OFF (you don't want to blind yourself for the next step). Next look down the lens and take a picture. You should see a tiny flicker in the center of the lens as the shutter opens and closes. If no movement is seen, then you likely have a stuck shutter. If so, please see this link for further info and a simple fix that may help.

sounds like you have shut off the lcd viewfinder part of your camera. go into the menu to make sure it is on

A stuck shutter is another common failure mode for digital cameras. The symptoms of a stuck or "sticky" shutter are very similar to CCD image sensor failure. The camera may take black pictures (for shutter stuck closed), or the pictures may be very bright and overexposed, especially when taken outdoors (for shutter stuck open).

To confirm a stuck shutter, put the camera in any mode other than "Auto", and turn the flash OFF (you don't want to blind yourself for the next step). Next look down the lens and take a picture. You should see a tiny flicker in the center of the lens as the shutter opens and closes. If no movement is seen, then you likely have a stuck shutter. If so, please see the following for further info and a simple fix that may help:

http://camerarepair.blogspot.com/2009/05/simple-fix-for-stuck-shutter.html

Check if you have activated the Electronic Viewfinder (EVF). Press the EVF/LCD button to switch to the LCD screen. If this fails to solve the problem, change the mode dial to Auto (the red camera icon) or 'P' and try again. If even this does not work, check with the nearest authorized service center.

If its black when you look thru the viewfinder its likely because the mirror is stuck in the up position. It will often do that if the batteries are exhausted. Try replacing the batteries.

The mirror might release back down if you turn the shutter speed dial to M90. This is a manual release of 1/90 second for when you need the shot but don't have any power.

When you look in the lens opening and adjust the aperture dial, you are seeing the aperture open and close. Not the shutter. You need to open the back of the camera (without film) and take a photo to see the shutter curtains open and close.

You should have a read thru the manual to become familiar with the camera and its operation:

http://www.cameramanuals.org/nikon_pdf/nikon_fg.pdf

Sony (who bought KM) will fix this for free. http://esupport.sony.com/US/perl/news-item.pl?template_id=1&news_id=131