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Message: <blockquote data-quote="willfly4food" data-source="post: 284426" data-attributes="member: 23336">Hi everyone,I'm new to this forum, and was hoping you could give me some advice. My Nikon D3100 has developed a problem: the shutter gets stuck such that it covers about 25% of the sensor. I do not get any error messages, but it is obvious when my pictures have a portion blacked out. To confirm this was the problem, I took the lens off, locked the mirror up, and took a look. Yup, shutter is not retracting completely. I then gently dusted off the assembly by spraying helium on it, put the lens back on, and left it alone to go seek advice. I have not tried prodding anything yet, just took a look. I'm lucky enough to have access to a cleanroom environment (and helium) at work, so I can easily look at optics without fear of getting them dusty. My question to you guys: have any of you experienced this before? If so, what did you do to fix it? Are there any known procedures for how to fix this myself? My camera is out of warranty, so my options are to go to a camera repair shop, or take a shot at it myself. I have not repaired cameras before, but I'm a technical person and don't have a problem following procedures. I don't know what caused this issue to develop, it really seemed random. I didn't drop the camera, I keep it fairly clean, and it is lightly used (mostly because I don't know how to use it very well, haha.) Thanks for any advice you may have.</blockquote>