Erik's right as usual
When you turn it on from cold the power light turns on green n then a second later slowly fades to orange... after the previously mentioned timespan it clicks audibly and turns green. Before the click and green, it sends nothing to the speakers....
If it's warmed up (ie has turned green) and you turn it off, there is some time period where you can turn it back on and it doesn't go through the orange phase. So, it feels like there is some "warmup" going on. Or charging up a capacitor or somethingt....
Let me know if you're interested ....