I've got a 36x48" Chinese laser that's been working OK for a couple years now. Right now, it turns on fine and can download programs fine. You can jog the Z axis normally, but the X-Y axis don't do anything. They are powered (You cannot move them by hand), but they don't respond to the controls. You can run a program and once the program is done, it beeps like it was completed, but the XY never even moved. All the controls look good. The lights are on, supplied with power etc. Any ideas?