3.4. Installing additional memory..............................................................14Install DDR DIMM .............................................................................14Remove DDR DIMM ..........................................................................14To reconfigure your computer...........................................................143.5. Upgrading CPU .................................................................................15Remove CPU.....................................................................................15Install and upgrade CPU....................................................................164. Troubleshooting ..........................................................................................175. Taking Care of your computer .....................................................................195.1 Important tips ....................................................................................195.2 Cleaning and servicing .......................................................................19To clean your computer and keyboard...............................................19To clean your pointing device............................................................19To clean your optical mouse..............................................................20To clean your monitor .......................................................................205.3 When to contact a service technician..................................................20Asking for technical assistance ..........................................................20Remark: All the drawings in the Guide are diagrams. About components’quantity and style, substances shall take precedence.4