Funny Computer Noise

Now the minute you read that, you should tell me to take it in to be checked out. But my stepdad says it’s been making the noise all day, and it hasn’t melted or anything.

It sounds almost like static, coming from the tower. When I turn off the computer, it fades out, instead of just stopping. When I restart, it doesn’t stop at all.

It’s really annoying, and I have no idea what it could be. I even cleared all the cat fur from in front of the fan ports!

Any ideas?