Viewsonic PJD6221 technical question

[geeketeach]

We have five (5) Viewsonic PJD6221 projectors that will not "light up." Blue power LED illuminates, but when depressed, nothing happens. Projector Status on browser shows "Normal" and System Power shows as either OFF or ON when power button depressed. All projectors worked at the end of last school year. All five do not work now.

 

Any suggestions? I read another thread that indicated a possible terminal HW issue. It is so puzzling that they all failed at the same time.