Hello, About 14 days ago, I emailed this list about my G4 MDD which was beginning to freeze up and lose the USB ports. I put in a replacement board and now only the fans run. There is no gong, the Apple Studio Display monitor does not light up, but the right LED on the motherboard does illuminate, which seems to indicate that the power supply is okay. The lithium battery shows 3.6 volts on my VOM and I pressed the PMU reset button to no avail. Am I forgetting something? Thank you, Bruce Nakamura