Good day guys , I am having a sort of weird problem . Alot of the preinstalled software that comes with Mac OS ,are not working . For example : Facetime , preview , photobooth ....Terminal .... All of the above programs are doing the exact same problem , after being clicked , they appear to be about to open , (icon jumping etc ) but nothing happens , due to the fact that preview is not working , i cannot view any photos on the macbook. I have tried creating new user and trying to open them but again same issue . Please let me know if anyone has any suggestions please .