Changes
/* 1. Screen functionality and connectivity */
'''*LED Diagnostics feature is available only for models configured the with FM-AT3 FACE module'''
== I don't have any display output, there's nothing on the screen ==
* The best way to check screen functionality is by connecting to a good known working machine.
'''*LED Diagnostics feature is available only for models configured the with FM-AT2 AT3 FACE module'''
===2. Validate memory===