Due to the solenoid board for my 1977 Bally power play being extremely inconsistent and unreliable, as well as the wrong solenoids firing at the wrong times (etc the bump caps fire instead of the bells), I replaced and resoldered a significant amount of components on my solenoid board, including all the header pins, the 19 resistors, 19 IN4004 diodes, and 19 transistors on the bottom of the board, 9 of the 19 capacitors on the bottom of the board connected to the transistors I replaced, the two IN4004 diodes linked to the flipper relay and the high voltage regulator, the two large capacitors (c23 and c26), and capacitor c24. After all of these replacements, I plugged everything in and fired the machine up, and instead of the machine booting up like normal, the machine immediately made a loud electrical buzzing and wouldn't boot at all. I quickly unplugged the machine, and I'm not too sure where to go from here, as this wasn't the problem I had before replacing many of these components. I do not want to plug the board back in and ruin any components due to some kind of overload, but I'm not sure how else to go about testing a fault on the board. The transformer of the pinball machine hasn't had any issues before, so I don't think it is related to it, but I do plan on eventually replacing the transformer altogether due to its age. Any suggestions would be greatly appreciated. I can post pictures of the top and bottom of the board if needed.