I didn't change a thing. I started it the other day and the mouse and keyboard did not work - everything laoded fine. I forced a shutdown and then restarted it. That is when I had the problem. I had an extra CPU fan and installed it, at the same time cleaning the processor chip and using Arctic Silver 5 exactly as per the instructions. I plugged the CPU fan into a different 12v receptacle and it worked. There are no beeps or any posting - it just runs. Before I cleaned the CPU it would only recycle - stayed on for a few seconds and then continually restarted. Any help is appreciated. Thx.