1. How to Perform Preventive Maintenance of the Personal Computer Properly Shut Down of the Computer Properly Shut Down of the Computer Unplug all Connection of the Computer Unplug all Connection of the Computer Open Side Cover Open Side Cover

2. Preventive Maintenance. Physical checkup of the Following. Physical checkup of the Following CD Drive CD Drive Floppy Drive Floppy Drive Keyboard Keyboard Mouse Mouse Panel Display Panel Display Indicator lights Indicator lights Switches Switches Internet Port Internet Port USB Port USB Port Video Ports Video Ports Casing Casing Cooling Fans Cooling Fans Power Supplies Power Supplies Power Cables Power Cables

3. How to Replaced Memory Press the Holding clips on both sides of the DDR2 DIMM socket outward to release the the DDR2 DIMM (a). Gently pull the DDR2 DIMM out of the socket (b)

4. How To Install a DDR2 DIMM Align the DDR2 DIMM with the socket (a). Press the DDR2 DIMM into socket until the clips lock into DDR2 DIMM (b).

5. How to Replaced Hard Disk Remove the computer hard disk. Detach all cables connected to the hard disk and pull the hard disk out. Remove the drive rails that hold the hard disk to the disk frame and detach the hard disk. Set the drive rails aside.

6. How to Install Hard Disk Insert the new hard disk into the frame and secure it with drive rails. Reattached all cables to the new hard disk.

7. How to Replaced Cd Rom Removing Cd Rom Mounting Screws. Removed IDE Cable.