I have a new Dell Studio 1558 with an i7 740QM processor. From new, my wife and I have detected an intermittent extremely high pitched whine/wwhistle - so high that if we are not facing in the right direction we can't hear it. I did some research and found out that it was not unheard of. So I called Dell and after a lengthy discussion. persuaded them to send someone out to change the processor. It was fine for a few days then started again. Now, here's the interesting bit. It only happens when I run Internet Explorer 8!! Why would the processor behave differently for a particular browser? I would love someone "in the know" to explain what is happening and whether there is a cure.