Sorry you're having troubles. I have a Countdown with a Pascal board. It has taken me 3 years to figure it out. In the end it was the under play field transistors. They would instantly blow every time I replaced them. I had not done the resistor mods before installing the Pascal board, and I had an issue of drop targets not resetting. I thought it was the boards, So I installed the Pascal board, and I think I damaged it in the process, because the solenoid was still sticking because of the bad transistor. Once I did the resistor mod, replaced the transistors, and then got the Pascal board repaired...... wa la.... it worked. It took doing all those things in that order to make it finally work.