Hopefully, it will be as simple as some blown fuses. Though I'm not familiar with Bryston amps, no power whatsoever often stems from that in 95% of amps my friends bring to me to fix. Externally, they should be at the back of the amp and/or in the IEC plug-in. Internally, you'll just have to look around, but they should be apparent. Even if you've never turned it on or if its never been powered up while in your possession, I'd check them out. Good luck. Cordially,