Speaker static sounds even after changing the speakers.

I recently got static noise from the speakers so I thought they were bad so I replaced them with new ones. Problem is it's still doing it so I then tried changing out the audio jack as well for a new one and it's still spewing a piercing static noise. I tried switching between mono and stereo. I tried using headphones and it's weird because the same static comes through the headphones as well. I tried plugging it into a sound system. I feel like I've tried everything. Is there a component I can test that might be the issue? What to do?