Whenever my MacBook is sat idle, the CPU gives off a really, really high pitched squealing noise. I tried picking up with a microphone but it's not picking up the frequency. I'm presuming it has something to do with Intel's power management battery saving clock speed magic. But it's driving me crazy. Has anyone else had this issue? Is there any way in which I can disable the idle clock speed changes (if that is actually the issue)? PS: It happens with or without the MagSafe plugged in. Thanks.