OKay so I turned on my Macbook (2.4 gHz White) today and noticed the fan was running very high. iStat has it set at somewhere around 6000rpm. Anyway, I was looking through iStat to see what could cause this and found that my CPU usage for user is up around 90% plus. This is odd though cuz all I have open is Firefox and Mercury Messenger. What I was wondering is why would the usage be so high and how can I avoid it cuz frankly with the fan running this fast I get the feeling I might burn it out.