You can try and disconnect it from the power outlet and then reconnect it after a few seconds. Most likely this does nothing, but it is worth a try.
Other than that I don't know the system, but if it is a fancy one it could be worth having checked out at a repair shop. The other option is to take it apart and look for something that is wrong, but that requires some electronics knowledge (First rule is to disconnect it from the electric power).. Try googling hifi DIY repair and similar
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Donovan PuppyfuckerA dagger in the dark isworth a thousand swords in the morningRegistered Userregular
Does it have a replaceable fuse somewhere on the back panel?
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Other than that I don't know the system, but if it is a fancy one it could be worth having checked out at a repair shop. The other option is to take it apart and look for something that is wrong, but that requires some electronics knowledge (First rule is to disconnect it from the electric power).. Try googling hifi DIY repair and similar