On the far right of the mother board is the black power supply. If you stoop down low and look up into the power supply, you will see a small bunch of test pins, each having a number indicating the voltage. Start with the one that has a "5" and see if he 5 Volts is up. Next, check the 24 Volts. The 24 volts can go all over the machine on some integrations, but mostly are used to power the pushbuttons and limit switches. If the 24 gets shorted due to wet limit switches etc, the control won't start. Also, the power supply can just go bad. Be EXTREMELY careful not to short the pins together. This could let some smoke out. Getting the smoke back in takes lots of money.