Currently Being ModeratedMay 7, 2012 7:18 AM (in response to khan_faruq)
Open the Activity Monitor
> Applications > Utilities > Activity Monitor.app
Select the %CPU tab (twice if necessary, so the little triangle/arrow is pointing downards).
What process is hogging up all the CPU?
Currently Being ModeratedMay 7, 2012 7:57 AM (in response to softwater)
Don't forget to change the control in the upper right corner from "My Processes" to "All Processes"