Replacing The Motherboard - Lenovo ideaCentre N300 Maintenance Manual

Step 5. Disconnect the data cable from the front indicator board.
Step 6. Remove the 2 screws that secure the front indicator board to the rear cover.
Step 7. Lift up the front indicator board to remove it.
Step 8. To install the new front indicator board:
a. Line up the front indicator board with the mounting holes on the rear cover and secure
it with the 2 screws.
b. Connect the data cable to the connector on the motherboard.
Step 9. Reattach the rear cover.

Replacing the motherboard

Note: Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the rear cover.
To replace the motherboard:
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 rear cover. Refer to "Removing the rear cover".
Step 5. Remove the memory modules. Refer to "Replacing a memory module".
Step 6. Remove the heat-sink. Refer to "Replacing the heat-sink".
Step 7. Remove the Wi-Fi card. Refer to "Replacing the Wi-Fi card".
Step 8. Remove the hard disk drive. Refer to "Replacing the hard disk drive".
Step 9. Remove all the cables connected to the motherboard.
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Lenovo N300/308 All-In-One PC Hardware Maintenance Manual