Sometimes the system is unable to blank out the screen. If you
find that you cannot enter commands through a console that otherwise
appears normal, try to restore the screen by performing a CANCEL action.
Note: Inhibited input, with or without keyboard locking,
can also occur when the system abends or goes into a wait state, or
when a problem occurs in the message handling portion of the control
program. See the procedures described for an inactive console under
System errors.