Every Christmas it falls on me to fix my grandparents computers. Usually other relatives get there before me and try to fix the problem, usually with little or no success. This past year was my all time favorite for computer problems, the computer would shut down shortly after startup. Other relatives attempted to fix it but no luck. Everyone thought it was a virus. After some looking around, I went into the bios where after digging around a little bit I saw that the temperature for the CPU was really high. Opening up the case showed why, the CPU heatsink and fan was so full of dust that there was no way for any air to move through it. Cleaning that out fixed all of the computer problems.