I'm having trouble with a FF Dreamer. It powers on. I can control all steppers manually. It will home just fine. I can control the printer via USB. It will heat to appropriate temperatures, and all the fans work. However, it will not print a g-code file. When I select the file to print, the printer initiates the print by heating the print bed and extruder, but the print does not begin after the target temperatures are reached. There is a tone-like sound when the heaters are active, and the stepper motors feel frozen. I have to restart the printer to cancel the print. On startup all seems to function normally until I try to print a g-code file. Any thoughts?