1. Try leaving the toggle switch on for 30 seconds without pressing any buttons.
2. This will give the control time to go through its own internal start-up sequence

This applies to DynaTrol controls made before 2006:

1. When these older controls are running a program and the toggle switch is turned off without pressing the STOP key first and then the switch is set back to on: the screen will blink and go blank for 10-15 seconds then come back on.