Have had my 60D for several years and no issues ever. Was shooting in action mode, and the last four pictures were black. The LCD screen works when menu or info is selected. I can't see through the viewfinder or see anything on the LCD screen. When the info button is pushed there is Exp Sim flashing. Any help or suggestions?
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Nikons, at least the lower end ones, do not have this option, and always compensate in Live View.
The first thing I'd do is try another mode and see if it makes any pictures at all, and make sure the lens is properly seated, so that its electronics are working correctly.
I'm unfamiliar with the various options on a Canon, but if you set the exposure to manual and some value that's at least close to correct exposure, you should get some kind of image. On a Nikon in purely manual mode you can shoot with no lens at all mounted, and get a blurry image of something other than black.
If you can't get anything, then I'd suspect a camera or lens problem. Otherwise, perhaps some setting gone awry somewhere.
Another thing you can try, again in manual mode, is to take the lens off, put the camera in manual mode as before and set the shutter speed for a second or more, and look into the front of the camera when you press the shutter button. You should see the mirror flip up, and the shutter open. The shutter is flat black, and the sensor bright and reflective, so if you don't see a bright reflective rectangle, the shutter is probably not opening. If this does not happen, then your camera has a problem.