Replacing the front fan assembly - ThinkCentre M81 (type 0268, 1730, 4166, 4169, 5030, 5048, 5069, 7517)
Do not open your computer or attempt any repair before reading and understanding the "Important safety information" in the ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy of the ThinkCentre Safety and Warranty Guide, go to:http://www.lenovo.com/support
This section provides instructions on how to replace the front fan assembly.
Note: The front fan assembly is only available in some models.
To replace the front fan assembly, do the following:
Turn off the computer and disconnect all power cords from electrical outlets.