It’s a long sordid story but here goes. I hadn’t played TZ for a few months and and out of state friend visited and started a game. There was no sound. The diagnostics said there was a U9 sound rom error. I decided to check all of the connectors and socketed chips by removing and replacing. Checked all of the fuses by removing them and testing them with meter. After this I couldn’t start a game and the diagnostics enter switch did not work and the DMD was frozen. Before I checked the connectors and fuses I could play a game with no sound. Ouch! I caused more harm. I decided to send all of the boards to Chris Hibler. He replaced the sound board U9 RAM and checked all the other boards as OK. I reinstalled all the boards and still can’t start a game or enter the diagnostics and the DMD has frozen garbled stuff. LED D20 and D21 on the MPU light as they should as well as the voltage LEDs on the power driver board. On power up sometimes D20 doesn’t blink unless a I cycle the power switch a few times. When D2O blinks I get GI lighting and attract lighting but can’t start a game or enter diagnostics. Without the diagnostics I’m lost. Any ideas?