I am trying to get my Stern Nine Ball going. I installed a new rectifier board and all my voltages are reading correctly. I went through my solenoid driver board and replaced the caps, did the ground mods and tested. Again all voltages check out correctly at the solenoid driver board. I installed an Alltek MPU board, when I turn the machine on the 5 volt LED comes on and the top LED will flash 7 times like its supposed to, but then nothing happens. No displays, no coil resets, no attract mode, nothing. I have not repined any connectors other than the rectifier board. Could that be my problem or am I missing something else?