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OK so is it possible that the shutter was just stuck from sitting for a long period of time? the woman who sold it to me said she never used it much, I took off the lens while the mirror was stuck up and i touched the shutter curtains..moved them a little then put the lense back on turned on the camera took a test shot and voila--no ERR message and now its taking pictures!!! WOOO HOOO Im so excited!
It sounds like the shutter is set to "BULB" or a timer mode. In bulb mode, you would see the image sensor when the mirror is up, otherwise you would see the shutter curtains.....I took the lens off and it looks like the mirror is getting stuck in the "up" position and once I hit the shutter release again it then goes down but no picture is being taken....
.... if any other models other than the D90 roll over back to 1 after hitting the 10 000 actuation mark?....
None of Nikon's cameras roll the shutter actuation count back to one. That is the file numbering count, and it doesn't actually rollback to 1.
The only way to read the total shutter count is to make a JPEG image and then use an EXIF reader to find the line in the EXIF data that shows shutter count.