Were you using sudo? If that is the case, there may be nothing wrong.
Originally Posted by Rebecca_D
When I do this
the terminal is waiting for my password. In this situation, you do not see what you are typing. You have to type in your password and hit enter, and then it will continue.
mick@mick-ideapad:~$ sudo lshw
[sudo] password for mick:
If, on the other hand, you were using gksu or gksudo and a box outside the terminal popped up and wanted your password, then I don't know why you couldn't type in there.