Originally posted by gradus
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In the meantime, re your connections. Surely the first thing to do is to check the output of your headphone socket - maybe plug in some headphones and see if anything comes out. If there's nothing there, then there's no way your Yamaha amp will be able to produce any audible sounds. In that case you've maybe muted the sound using the controls in your PC. If that's the situation, then unmute the output, and hope that everything should then work.
If the headphone socket works then you need to turn your attention to the input to the amp. Are you using an integrated amplifier with an in-built pre-amp? It could be that you've fed your headphone output to one of the inputs which requires a relatively high input signal level, in which case the sound level will be low. If your amp is simply a power amp, then the signal level will almost certainly be far too low. However this does seem moderately unlikely, as many of us do use integrated amps, which have the in-built pre-amp stages to switch and boost the inputs. However, just in case you are trying to feed a signal to a power amp, then you most likely do need a pre-amp to get a result. Does that make sense?
I think the most likely thing is that you do have an integrated amp, and that the problem lies on the PC side -with a muting control.
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