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Lacking a large physical volume to circulate cooling air while turned on, notebook computers are more vulnerable to heat damage than desktops. Often containing only tiny cooling fans, and using the notebook itself as a heat sink, overheating is the principle cause of internal notebook failure. The more powerful the processor, the more prone the notebook is to overheating, a well-documented problem. I have heard several anecdotal stories of fairly new notebooks failing when left on overnight, due to overheating. I recently replaced my oldest daughter’s notebook due to that exact cause. Published reports indicate that the average life expectancy of a notebook computer is only about 18 months, before it is lost, stolen, accidentally broken, overheated, or worn out. Notebooks, on average, have only about a fourth of the longevity of a desktop.