The central processing unit inside a laptop computer performs the various calculations needed by any software program you use. Unfortunately, these units can become very hot as they are being used, so they need an attached cooling system to keep them from malfunctioning. The cooling system inside a Toshiba Satellite series laptop consists of a metal heat sink unit and a cooling fan. If your laptop powers itself off randomly, or will not boot up at all, the cooling system may have stopped working. You can fix the problem on your own by opening up the laptop's case and manually replacing the cooling system.
Power off your Toshiba Satellite series laptop and wait for the operating system to fully shut down. Close the LCD screen's lid and then flip the Toshiba laptop over so that the bottom side of the case is facing up. Locate the battery-release latch just below the battery itself. Hold down the latch and remove the battery from the case.
Set the Toshiba Satellite laptop's battery aside in a safe location. Flip the laptop back over and then open the LCD screen's lid so you can see the keyboard. Slide a thin and stable object, such as a screwdriver head, underneath the large plastic bezel located between the keyboard and LCD screen. Wiggle the object up and down until the bezel unlocks from the Toshiba laptop's case.
Lift the bezel off the Toshiba laptop and set it aside. Find the two screws located at the top right and top left of the keyboard. Remove the screws and set them aside. Pull the entire keyboard off the laptop's case by an inch or two until the keyboard cable is visible. Disconnect the cable from the motherboard and set the keyboard aside.
Find the cooling system assembly, which will be located directly over the Toshiba laptop's central processing unit. Remove the screws holding the cooling system to the motherboard. Lift the cooling fan and heat sink unit off the central processing unit and discard them. Set the replacement cooling system in its place and reconnect its screws.
Set the keyboard back onto the case and reconnect the cable running to the motherboard. Replace the two keyboard screws. Push the plastic bezel back onto the laptop until it clicks into place. Replace the battery and then power on the Toshiba laptop. Let the operating system finish loading, then use some of the software applications you normally interact with to make sure the new cooling system was installed correctly.
Depending on how long the cooling system has been nonfunctional, the central processing unit may have sustained permanent heat damage. If that is the case, you will need to replace the processor as well.
The parts inside a laptop can easily be damaged or even destroyed by the discharge of static electricity from your hands. Before you open the Toshiba laptop's case, ground yourself by briefly grabbing onto any large metal object that is connected firmly to the floor.