Just an update. I received another MPU and put my game chips into it. Installed. Same result. No VFD display this time and still red LED flashing. Installed new power supply. Same results. I have sent the first MPU to Lookes for repair and test. I will be sending the second MPU after I get the first one back from Lookes. Will report how it goes. Thank you for the help so far. Any one know where I can purchase an SB100054?