Nothing shows up on the screen when I type my password
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?