Originally Posted by
the_gentlegiant
Are you Zero Returning the machine each time you turn it on? If you don't have batteries backing up your servo position, you have incremental encoders that need to be homed after every power on. You don't mention any alarms so that's good.
Try turning on the machine control while holding in P and CANCEL. DO NOT HOLD ANY OTHER KEYS! Hold in P and CANCEL until the control comes up. Then Zero Return the machine in the normal manner. Likely by hitting the +X +Y and +Z keys with the Mode Switch is in ZERO RETURN. To play it safe, have your Rapid Over-ride set in the middle somewhere. Also make sure all axis are at least a few inches away from he home position before Zero Returning. In fact you should always leave a machine like this with the axis away from home when you shut it down.
This will likely fix your problem. Let us know if it doesn't.