The other day I heard a strange sound coming from my computer, I thought it was from the speakers but it was only on the left side. I tried unplugging the power and the sound went away. Plugging back in, and the sound was back. It was very quiet, kinda static like but also a little crackly. I'm a little worried, as I've seen pictures around here of someone with a fried plug, and I also of course don't want to risk the computer. Should I call apple care or take it in, or is this normal?