Do you have a question about the Ciara Horizon D12750 and is the answer not in the manual?
Unscrew 8 screws to remove the motherboard.
Unscrew 8 screws to remove the motherboard.
Press latch and pull out the 3.5" HDD.
Turn latches counterclockwise, remove heatsink, open lever, lift cover, remove processor.
Turn latches counterclockwise, remove heatsink, open lever, lift cover, remove processor.