Computer playing sound from a TV commercial. How does this happen This just started happening tonight on my iMac running High Sierra. About every 15 or 20 minutes my computer plays the sound track, or part of the soundtrack, from a common TV commercial. This Capitol One commercial is probably used on many websites but I don't know that for sure. I don't know how or why this is happening but I'd like to turn it off or stop it some way. I've had this happen when I have a web page open and a commercial is played but I have closed all browser windows and quit all browsers. But that didn't stop it. I don't see anything happening on my computer when the sound starts playing. I ran Malwarebytes but it said my computer is clean. How does a sound play without an application? Can someone tell me how to find what is going on?
I opened activity monitor and checked it whenever the sound started playing. Dashboard started using a lot of computer resources when this occurred. I inadvertently copied something to the dashboard that would play these soundtracks. I deleted 2 files there that I knew nothing about and that solved my problem.