Hi, my Amplifi 150 (I also bought the FBV3) has all four (ABCD) lights on (not blinking) no Bluetooth. I just updated my G10 relay transmitter and receiver so I know my pc USB port is working, the PC's drivers are working. My amp is not working. The motherboard appears to be out of stock at Compass. The only post that seemed to correct this problem was the chip/transistor replacement by a technician. I have tried the SD card replacement. It worked for a few days and then the fault reappeared. I am going to try the SD card a second time and will post back.