Hopefully my post will help others with a similar problem. If you have the problem Operating System Not Found when booting up your computer, it may be due to it overheating like me. Also, my computer's light indicating it was accessing the hard drive would constantly be on. To fix it I simply cool it down in front of a large fan for about 10 minutes and it works again until I next shut it down. Just recently though I had installed a second fan in my computer to eliminate the need for me to do that to make it more convenient. It was successfully installed and I enjoyed several days worth of not having to leave my computer on to avoid the problem, not taking it to a fan to cool it down, and having the light not be on which made my computer faster ( but louder ). But after the first couple of days, my fan still works ( I can still feel cool air coming from the back), but it seems to have no effect, I feel it may have even made my computer slower than it initially was. Why is my fan no longer effective and how can I make it effective again? How can I prevent the light that indicates it is accessing the hard drive ( the one with the picture of the cylinder ) to stop being on and rather occasionally blink? Is there any effective way to keep my computer cool that is cheap?