Asus F1A55-M LE - Manual (Page 20)

5. When the APU is in place, push down the socket
lever to secure the APU. The lever clicks on the side
tab to indicate that it is locked.
6. Install a APU heatsink and fan following the
instructions that comes with the heatsink package.
You can also refer to section 1.6.2 Installing
heatsink and fan for instructions.
7. Connect the CPU fan cable to the CPU_FAN connector on the motherboard.
DO NOT forget to connect the CPU fan connector! Hardware monitoring errors can occur if
you fail to plug this connector.
Chapter 1: Product introduction 1-8