My computer lately started to make the sound like it was turning off and on by itself, I could hear it clicking and winding up and down as if going throuhgh the shutdown and start up procedure. Only thing was that the images on the screen would only freeze temporarily and then unfreeze. But now its to the point were it stays frozen and I constantly have to restart the computer. What could the problem possibly be? I have done scandisk, spyware checks, virus checks withe three programs, defrags and adware checks and it hasnt made much difference.