We purchased a 6040 CNCEST 3 axis router with parallel port a few weeks ago. been running decent until today. the display started flashing with zeros and will not fully power up or move around. we checked for 24 volts on power supply with a meter and oscilloscope and it seems to be just fine. 1 thing i can say is the display and a green light on the computer board above the power supply flash in sync. WE are not sure where to go from here. My father is an electronics engineer, but we have no schematics. Any help would be greatly appreciated as our production has come to a halt!