My Marantz NR1510 receiver suddenly stopped producing sound, even though the display worked and the connected television showed a picture. Before assuming the amplifier had failed, I checked the audio settings and connections. First, I verified that the receiver was not muted and that the correct input source was selected. I also checked the speaker cables to ensure they were firmly connected and that no exposed wires were touching each other. Next, I reviewed the speaker configuration and sound mode. Incorrect output settings or an unexpected audio format can sometimes prevent sound from reaching the speakers. I also tested another input to determine whether the issue affected the entire receiver or only one source. For model-specific troubleshooting instructions, I consulted marantz.manymanuals.com