The Diagnostic 770 Box is showing Many Different Coloured Blobs
If the unit is un-powered for some time the internal battery will run down and the internal clock will reset to 1970. On re-powering the unit you need to set the clock to the correct time using VT setup. (The battery will require about 30 hrs on charge before it is fully recharged.)
Next: The data was being collected regularly but suddenly no counts are generated.