|First open your computer side and look at the heat sink/fan assembly that is piggy back on top of your CPU. It is probably clogged with dust. Get a can of compressed air from electronic store and blow off the dust that is clogging it up (power off) and make sure that the fan turns freely. After that, leave the case open when you try starting again so you can verify that it is turning immediately. If it is still not turning, make sure that your fan is the typical square style that is held in with screws at the corners, if it is then measure the width in mm and note the number of pins on the connector to the motherboard and search for a replacement. If not you may need to do the slightly more delicate operation of replacing the heat sink (use new thermal compound and a heat sink spec'd for your CPU).|
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