It could be that the beomaster was used in an MCL2 multi room setup - if the beomaster was in option 0 then it won't respond to the remote, since command would have been sent to it via the MCL bus from a beovision or the like. Not easy to test unless you know someone with a suitable MCL setup - you'd need to set it to A.OPT 1.

PS. This was learned from bitter experience with my beomaster 7000. I previously owned a 5500 - great amp and I hope you enjoy it!

thank you for your suggestion, and yes its a great amp, unfortunately its not the option, its not receiving any signal, there seems to be a dry joint or loos connection, but its hard to locate. greetz from berlin!

No worries phonic, sounds like you've ruled that out! Just to say (in case you weren't) aware that if it's in option 0 it won't pick up ANY remote command, including the ones for option setting (bit of a design fault in my view). Good luck with the amp :)

If not option 0 problem... dead lithium cell on the cpu board. Then it will not react.

If even no reaction to the front switches: definitly dead lithium cell or dead 8031 cpu... the later is possible in link systems.