I have a question about my Macbook. I have a 2.16 GHz Dual Core Processor. Everything was going fine but i noticed yesterday that the fan was running very fast. I checked the temperature of the CPU and it is around 70C. Also the iStat widget says the User is using a little over 50% of the CPU which would mean one core is always being "used". But when I check the activity monitor there are no programs that are using the CPU. The bottom chart of CPU usage says one core is being used 100% but I cannot find what program is using all that CPU. Any ideas would be appreciated. Thanks.