No power to control panel

[amortellite]

The control panel does not light up. No lights and nothing on display. I unplugged the unit and plugged it back in to see if I here a "click" from the elect. control unit and did not hear anything. I ordered a new unit and installed, and still nothing. It humms and dashes showed up on display, but as soon as I pushed the power button, it went off. The old unit did not even hum. I noticed that there is a small amount of water left in the tub. Not a lot, but more than what I think is normal. Can anyone tell me what to check next?