I'm assuming you changed nothing..?? (since the last time you listened) Check inside for a fuse?--Double check: source in / mains out. All I can think of for now.
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The mute button on the Rogue 66 does not completely cut the signal, it only drops it 20dB or so, and you can still hear music if you turn up the volume, which then amplifies the crosstalk to audible levels. Turn the volume down, then make sure the mute button it is in the out (off) position. Double check that all connections in the back are correct.