I have a mid-2011 Mini that recently started to have high CPU usage problems. The fan has been running hard, CPU running on the hot side. Today, I opened it up, saw how filthy it was and cleaned it out really well. I thought the problem must be that the CPU was throttling due to heat, therefore processes that normally wouldn't have any problems with CPU, were all of a sudden running CPU to 100%. I figured cleaning would be like a miracle. After cleaning, the problem remains. We are not talking about anything crazy, just opening Chrome will shoot it up to 100% CPU. This has never been a problem. This Mini is strictly a media player and it has been running with the exact same setup for years without a problem. RAM is usually pretty wired, but not much page outs. Point is, this thing ran perfectly until a few weeks ago when this started. Next thought was Intel Power Gadget to see if my CPU is actually getting it's supposed clock speed or not. Chrome simply shouldn't use 100% of a 2.5ghz processor with one window open. Power Gadget will install, but will not open. I keep getting an error. Everything fit the compatibility requirements: 2nd generation Intel Sandy Bridge i5 2.5ghz, OS 10.7. It just won't open. So my next thought... Since this is a new problem, I am left to assume that something changed. Since I have not changed any software, only thing left is hardware. I am going to assume, maybe incorrectly that my CPU is throttled and the only thing left to do is reapply thermal paste. I didn't want to take it apart without a second opinion. Is there any other way to verify current clock speed of a CPU if Power Gadget won't open? I could maybe upgrade the OS, but I worry about the Mini's minimal resources on a newer OS. I would be willing to upgrade OS just to see if I could get Power Gadget to install, verify my theory and then just restore back, but there will be headaches involved to do that. Any other recommendations or ideas?