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My audio system consists of the factory head unit, a multi-channel amp, aftermarket component speakers and subwoofer.  Every time I push the power button I hear a loud noise - kind of like a “thump” as the system turns on. (It does not however do it when I turn the system off).  I’ve also noticed that I get a “buzz” sound through my speakers just before and during a cell phone call.  I know the system was grounded when originally installed but I’m wondering if a connection has come loose, or if it could be something else like my amp going bad etc.???