Heard a buzzing noise when I turned on my computer, so turned it off and on several times. Pretty sure it's not the HDD, because my computer has an SSD. Computer's barely a month old. There's no ...

8] Electromagnetic interference Speakers or other audio devices can also cause unwanted noise due to electromagnetic interference. This unwanted noise can be a buzzing noise, high-pitched noise, etc.

Fan noise Besides hard drives, the fan noise on desktops is another common sound. You should hear a steady whir that may increase or decrease in volume depending on how much the computer is being ...

Don't hear any sound coming from the card itself; the noise is clearly coming from (all 5 of) the speakers. After searching around a bit, I'm guessing it is indeed something to do with power.