It's possible that one or more loose cores of the speaker cables cause a short circuit (by making contact with the bare chassis of the receiver), which makes that the receiver goes into overload protection. Check if all your speaker cables are thoroughly twisted and connected to their respective inputs.
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It's possible that one or more loose cores of the speaker cables cause a short circuit (by making contact with the bare chassis of the receiver), which makes that the receiver goes into overload protection.
Check if all your speaker cables are thoroughly twisted and connected to their respective inputs.
Either the power supply went south or one of your amp output stages has been blown.