Follow the procedure in Before working inside your computer.
Save and close all open files and exit all open applications.
Shut down your computer. For Windows operating system, click Start > Power button Power > Shut down.
NOTE: If you are using a different operating system, see the documentation of your operating system for shut-down instructions.
Disconnect your computer and all attached devices from their electrical outlets.
Disconnect all attached network devices and peripherals, such as keyboard, mouse, and monitor from your computer.
CAUTION: To disconnect a network cable, first unplug the cable from your computer and then unplug the cable from the network device.
Remove any media card and optical disc from your computer, if applicable.
Remove the cover.
Removing the System Fan:
Press the clip to release and disconnect the system fan cable from the system board.
Pry and remove the system fan away from the four grommets securing it to the back of the computer.
Installing the System Fan:
Place the chassis fan in the chassis.
Pass the four grommets through the chassis and slide outward along the groove to secure in place.
Connect the fan cable to the system board.
Install the cover.
After working inside your computer
Replace all screws and ensure that no stray screws remain inside your computer.
Connect any external devices, peripherals, or cables you removed before working on your computer.
Replace any media cards, discs, or any other parts that you removed before working on your computer.
Connect your computer and all attached devices to their electrical outlets.
Turn on your computer.
