I had a problem like this, i.e., immediate power off and words "Good Bye" after pressing the power button on. After some investigation, I have found the problem. It was not in electronics, but in the black plastic mechanical voltage selector (p/n AKX-507) at the rear, which allows to switch the input ac voltage between 110, 120-127, 220 and 240 V. With time the plastic deteriorated, and the switch just felt apart, so some contacts were lost. I guess it will be nearly impossible, or very expensive to find the same voltage selector these days. But if your download the service manual, you can figure out which pins out of six should be connected to get your voltage. That what I did. unplugged the amplifier from the power outlet, opened the metal cover, to get access to the voltage selector from inside. In the selector I connected two pins 3 and 4 directly, this is to get 240 V required for Australia. The easiest way to connect the pins is to take wire off one pin and connect it to the another in addition to the wire already sitting on it.
There should be different pins to connect in case of different voltage. For 100 V, you must connect together two pairs of pins: 1 with 5, and 2 with 6. For 120-127V, you must connect together two pairs of pins: 1 with 4, and 3 with 6.For 220 V only one pair of pins must be connected, which is 2 and 5. And as I wrote earlier. for 240V it one pair too, which is pins 3 and 4. You can figure pins numbers by checking where the wires to which they connected are going to. You need the service manual with the board diagram.
This simple two wire connection solved the problem with the power off of A-P510, so the music centre is back to service.
Maybe it's a fuse that automatically turns it off, send it to a service
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