New
#11
Just to eliminate something... have you already checked that the password the computer actually sees is the one you tried to type?
It could be a keyboard problem (eg. Shift key not working)
In case you didn't know how to do this, once you type in your password, but before pressing enter, there should be a symbol at the right hand side of the password box. (The symbol is part of a circle above a smaller circle- I think it's supposed to resemble be an eye.).
Click on that symbol before pressing enter to see what it thinks you typed - is it what you tried to type?