Just come in the login screen and continue with the following steps
Step 1: Ctrl+Alt+F1 <you got login screen in console mode>
Step 2: Enter “root” <Demanding for entering password>
Step 3: Enter “root password”
Step 4: Enter “passwd <user name>”
Now enter a new password then it is asking for retype the same password.
Now your password is changed, try your fedora with a new password with same username.
youthsm 