Hello. I have a small home based recording studio. I use a digital/ audio interface and two powered studio reference speakers. My computer is an HP a6752f desktop. Over the last couple of weeks, I started to develop a popping and hissing noise in my speakers. It comes and goes and sometimes causes a complete drop out of audio. I have the same issue when using headphones so I know it is not a speaker problem. I have tried my digital/ audio interface on other computers and it works fine. I am not sure, but I believe that my external interface overrides the integrated onboard audio so I don't think it is my computer's soundcard (or am I wrong?). Any help would be greatly appreciated. Thank you.