Lenovo IdeaCentre K3 Series Hardware Maintenance Manual

Chapter 7. Replacing hardware
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2. Screw back the screws on the metal bracket.
Note
Use only the screws provided by Lenovo.
Replacing the CPU
Attention
Do not remove the computer cover or attempt any repair before
reading the “Important safety information” in the Safety and Warranty
Guide that was included with your computer or in the Hardware
Maintenance Manual (HMM) for the computer. To obtain copies of the
Safety and Warranty Guide or HMM, go to the Support Web site at
http://consumersupport.lenovo.com