I made a video so you can hear the sound:

I use an external sound card, which works perfectly fine. But I'm getting this constant crackling sound through the laptops speakers. It doesn't sound good at all, and is constant. It doesn't go away if I change the volume.

Was fine last night and early this morning. Now...it's not.

My laptop is an Acer Aspire 5610.

IT'S DRIVING ME NUTS!!!