iMac late 2009 Current version of mountain lion The other morning I woke to my computer making a very loud noise (fan I'm assuming), after waking up the computer the noise stopped but suddenly any program I touched made the color wheel come up and the program to either become unresponsive or insanely slow and delayed. I've repaired and verified through disk utility with no success. I checked activity monitor and I have 90% idle roughly and almost 2Gb free ram. Nothing new has been installed. The only thing I've done differently was I had a gaming amp and headset powered through the USB. Can anyone help? Thanks in advance.