Replacing The Cpu - Lenovo IDEACENTRE 300s series Maintenance Manual

Step 6. Remove the 4 screws that secure the heat-sink to the motherboard.
Step 7. Lift up the heat-sink to remove it.
Step 8. Install the new heat-sink：
a. Line up the screws on the new heat-sink with mounting holes on the motherboard and secure
it with the 4 screws.
b. Reattach the microprocessor fan to the heat-sink.
c. Reconnect the microprocessor fan power cable to the connector on the motherboard.
Step 9. Reattach the computer cover.

Replacing the CPU

Note: For this procedure, it helps to lay the computer flat.
To replace the CPU
Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating
system, and turn off the computer and all attached devices.
Step 2. Unplug all power cords from electrical outlets.
Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O)
cables, and any other cables that are connected to the computer. Refer to "Left and right view"
and "Rear view" for help with locating the various connectors.
Step 4. Remove the computer cover. Refer to "Removing the computer cover".
Step 5. Replacing the heat-sink assembly. Refer to "Replacing the heat-sink assembly".
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ideacentre 300S Series Hardware Maintenance Manual