I set up my new Dell All in One. I use passwords and so when it asked, I input a password and repeated it. The last character was an Exclamation Point. After pressing Enter, the computer told me that special characters were not allowed. So I used the backspace to erase the last character in both fields, pressed Enter and the password was accepted.
Later, I turned back to the computer after it had gone to sleep. When I input the password, it was invalid. I tried several more times, each time making sure that I typed it correctly. Since it is a password string that I use elsewhere, I was certain I was typing it correctly. I called Dell technical support and just before the tech was going to send me a flash drive with an image of the system, I typed the password WITH the exclamation point. Voila! I was in! The screen had erased the final character from the screen but did not modify the two input strings that it read following the enter.