A quick thing to check if you have no power at all on a Stratasys Objet Desktop model machine is the internal power cables.
The main power cable will split to two cables once it enters the machine and on occasion they will become loose from the vibration of the machine. To check simply take the back cover off and on the right side you will see two power cables leading to the power supply. Just make sure they are not loose. We have also seen machines shutting down when from time to time while printing and this is the root cause.
Field Service Engineer
Computer Aided Technology, Inc