the last 2 alltek mpu's i have installed have had issues. on the first( bally power play) it wouldnt play the start up tune when you press the credit button to start a game. it play the start up tune on booting. did a ram clear, and tried it with and without free play, no different. not a big deal, but the owner isnt happy. today, i put one in a 6 million $ man. in free play, would not turn on the credit light, or start a game . this is with it set to free play. credit button works in test mode. oddly, if i set it to power play, star trek, or another game i cant remember, the credit light works, and it starts a game. i ended up doing a kitchen table repair of the orig board and the game works well. any feedback is appreciated. thanks