Hello Adyan, In the past, I’ve encountered instances where the BeoSound 9000 would lock up when the MasterLink was connected. On powering up, the unit would remain in standby mode. It’s difficult to say for certain if you're experiencing the same issue. This was caused by PCB32/PCB20. They were replaced at the time. Without physically inspecting the PCB, it is hard to diagnose down to component level. As a first step, I recommend checking the MasterLink socket for any physical damage. I've occasionally seen bent pins cause problems. Unfortunately, this PCB is no longer available as a new part, so we do not sell or loan PCBs. Prices for used parts on eBay have increased significantly, but it may be worth checking there for availability. If you're based in the UK, we can offer PCB repair services. We understand that sending the entire unit isn't always practical. For details on PCB repair and inspection fees, please contact Multicare Electronics directly.   Kind regards, Pete

Hello Peter, thanks for your answer and suggestions. Will have a close look at the connector again but I think thats not the problem. As I had no luck with contacting B&O Classic Service in germany my only option will probably be contacting Multicare and ask for pcb32 check/repair.   Thanks and Regards Christian