Why is my Microlab 600 controller screen not turning on?

If the controller screen is not turning on but the ready light is blinking, the power over ethernet (POE) has likely been turned off.  This happens when the power button is held down.

First, make sure that all power cords are plugged in.  Then, with the unit powered off, press and hold the power button for 5-8 seconds or until the screen turns on. 

To prevent this from happening in the future, simply press and release the power button – do not hold it down.