When I run sudo lshw in terminal, it asks for my administrator password, but it won't accept keyboard input when I try to type?

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http://askubuntu.com – I have been trying to run [sudo lshw] but it asks [password for grace: [] ] So when I try to type my password, it doesn't even come up with any letters, asterisks not does the [] move. I typed in my password as normal despite this and pressed [enter] but it just said, [Sorry, try again. Enter password for grace: [] ] But I can't type it in?! Can anybody help? (HowTos)