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Thread Starter 
I have a NAD 2200 Amp that I got second hand. It's worked great for a couple of months, and then suddenly yesterday it began giving me problems. If I turn on the amp, the speakers have a loud buzz, regardless if any input is plugged in. Then, when I turn the amp off, it makes a very loud pop on all of the speakers.

This happened suddenly one night. The AMP was on, with the TV playing through the speakers. Suddenly, it made a loud Pop, and now the current problems. If I try to put input through the amp, it makes no difference, and you can't hear whatever I play through the speakers.

I tried my best to explain the problem. Any obvious answers jump out to anyone?

Thanks