My calculator says "Waiting... Please Install Operating System Now", and when pressing any button it says “Error! Press any key to turn unit off. Then turn unit back on”, then the process just repeats itself. I have tried to restart the calculator but it did not work. I also tried to download an OS from the TI website from my Mac to the calculator but it also did not work. I believe it said something along the lines of it wouldn’t download the operating system to the calculator because the calculator didn’t have OS, which was kinda the whole point of trying to download it! I also could have done it wrong though, so any help would be appreciated on how to get my calculator working again.