In the long term, you need a new dynamic power supply. I had the same problem with a 4200 power amp. As long as the power amp was on (and warm), it came out of standby. Since the power amp does not start, it can help in the short term if you "warm it up" a bit. Pull out the mains plug. Then e.g. with a hair dryer at medium temperature, blow some warm air through the power amplifier. Then plug in the mains plug and switch it on again. It worked for me.
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