Asus AP120-E1 - Manual (Page 32)

2-6 Chapter 2: Hardware information
3. Position the CPU above the
socket such that its marked
corner matches the base of the
socket lever.
4. Carefully insert the CPU into the
socket until it fits in place.
The CPU fits only in one correct orientation. DO NOT force the CPU into the
socket to prevent bending the pins and damaging the CPU!
Gold Mark
5. When the CPU is in place, push
down the socket lever to secure
the CPU. The lever clicks on the
side tab to indicate that it is
locked.
6. Install a CPU heatsink and fan
following the instructions that
came with the heatsink package.
7. Connect the CPU fan cable to the
CPU_FAN1 connector on the
motherboard.