The CMX34 and the MX34 have its own power switches on the left side of the controller. Be sure that these are turned on.
If this is not the problem, please check the power supply and make sure that the controllers are powered with either a 24 VAC or a 24 VDC supply. If the power supply is active a green LED is visible.
Is this not the case, please check the main switch in the left bottom corner in the cabinet if it is switch on.