ActivTable displays "no signal" and goes dark
The table was donated to a school where I work as their technician. The table is a T-Surface; Serial number: **Removed by Promethean**. The power button goes through the normal sequence of colors and remains white. Nothing shows up on the table. I've connected an external monitor via DVI-d port on the table and the monitor displays, "no dvi signal". Any suggestions? Thanks!