I tried the paper shim going around between two lenses and body and lens, compressed air, allowing small amount of alcohol on q-tip on gap - and nothing would get my lens to open. Then I held in flat between my two hands and "gently" gave it a very light twisting diagonally, once in each direction. Hit the power button and it works fine now. As my gaffer used to say, "Don't force it! Get a bigger hammer!"