Amplifier Sound Output Repair

I'm currently experiencing a strange issue where my amplifier is not producing any sound. I’ve checked all connections between the amplifiers and speakers, but despite it all, I'm yet to gain success in resolving the problem. The amplifier isn’t showcasing any error messages or lights to indicate any technical abnormalities. Additionally, I have tried testing the amplifier with different audio devices, yet the results are all the same. Therefore, I need an audio technician who is skilled in:

- Repairing and troubleshooting amplifiers
- Interpreting hardware and system indicators
- Having a strong understanding of audio equipment

If you've successfully resolved similar issues, I'd appreciate your assistance in this matter.