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Helen Keller mode n.
1. State of a hardware or software system that is deaf, dumb, and blind, i.e., accepting no input and generating no output, usually due to an infinite loop or some other excursion into [deep space]. (Unfair to the real Helen Keller, whose success at learning speech was triumphant.) See also [go flatline], [catatonic]. 2. On IBM PCs under DOS, refers to a specific failure mode in which a screen saver has kicked in over an [ill-behaved] application which bypasses the very interrupts the screen saver watches for activity. Your choices are to try to get from the program's current state through a successful save-and-exit without being able to see what you're doing, or to re-boot the machine. This isn't (strictly speaking) a crash.