Hi, I have a Beomaster 3000-2 which won't power on. The receiver was working fine, but the connector for my Beovox 2500 cube came slightly loose from the back of my Beovox 3000. When I pushed the plug in firmly, there was a "pop" from the speaker and the receiver went dead. No lights, no sound, not even a hum. I'm based in Bangkok where most techs won't touch B&O gear and the local B&O dealer doesn't fix vintage gear, so I may be stuck fixing this myself. Any advice on what to look at first? Thanks for any insights!