Is your machine running slow lately? Wonder why you hear it whirring and the fan is going at 11? It may be busy or stuck on something. In the Utilities folder (/Applications/Utilities, or Go... Utilities, or cmd-shift-u) is the little app Activity Monitor. Run it, check that you're looking at All Processes, and sort by CPU. Now you can see if something odd is taking up all your machine's brain power! Contact CUS if something seems amiss.