d840 problem with start

Hello

I have problem with my cnc stepcraft d840.

My cnc was worked great.
Yesterday when i run the program UCNC on my tablet and press reset, my machine does not respond.
If you press the home button, the machine does not respond.

Maybe the problem is due to windows updates on the tablet pc ?
I tested power adapter(30V) and it is okay.
Green and blue light work.
The small 2 lights on the 30V power supply connector do NOT work.