Abstract: An ATM is operative to automatically self test a display module thereof. The test determines whether the display module fails to produce an acceptable display output. A predetermined color sequence is sent to the display module for display thereof. A sensor device positioned adjacent the display module screen senses displayed colors. A machine computer determines whether the display module displayed the correct color sequence. A display module error signal is generated responsive to the display module failing to display the proper color sequence. Testing of the display module can continue repeatedly to continually update its operational status.