In this day of age, with the components involved, it is unlikely that there will be bad parts from a good supplier. If we take the parts out of the equation (expect those that might have been fried by a mistake) we find ourselves with the board, and the solder job. Peter makes GREAT boards, so that is probably not the problem. Get a magnifying glass and start looking. Don't look where you think the problem might be. Look everywhere. Start from one corner, and work your way across the entire board. Check every solder joint and every trace. Patience here will save you much more madness down the road. In fact, this is a good step before you fire up ANY project, even with years of experience. Tiny shorts can always pop up. Once you verify solder/traces, check each componant. Check the value and orientation, replace anything that might have been fried, and follow along with the schematic. Start to learn how the circuit works. You don't need to fully understand everything, but learning in general where the audio path goes is a good place to start learning. Good luck, and stick with it, eventually it will be working, and you're gonna feel damn good about it!
Andrew