Audio and video periodic pulse noise in my inspiron 15 5000
I brought a Dell Inspiron 15 5000 (which runs Win 10) since January, so it's only 8 months.
At first, I noticed there was a pulse sound every time I scroll down Facebook page while playing Facebook videos, but Youtube videos were fine once I closed the Facebook.
Now, the pulse noise appears roughly every second when I play just any forms of videos and audios online and offline. It even appears when I play games, and when I recover my system (with the female voice notification). Online videos also appear to have a very small lag for less than 0.1 second.
Apparently, I tried recovering my system and remove everything, doesn't work;
Troubleshoot a few time, doesn't work;
Tried uninstalling Dell Assist and Customer Center, the anti-virus thing that comes with the system (forgot the name), as somebody suggested online, doesn't work;
Tried uninstalling and installing RealTek high definition sound drive, doesn't work;
Tried changing dcp latency, doesn't work;
Tried turning my laptop back to the factory setup; doesn't work.
Hence I suspect it's a hardware issue. I'd try to avoid reinstalling/recovering the system at this point without any solid solutions, I just got a lot of software installed.