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NOTE: Ensure that the computer is off and not in a power management mode. If you cannot shut down the computer using the operating system, press and hold the power button for 4 seconds. 3. Disconnect your computer and all attached devices from their electrical outlets. NOTICE: To disconnect a network cable, first unplug the cable from your computer, and then unplug it from the network wall jack. 4. Disconnect any telephone or network cables from the computer. NOTICE: To help prevent damage to the system board, you must remove the battery from the battery bay before you service the computer. 5. Turn the computer upside down. 6. Slide the battery release latch and remove the battery. 1 battery 2 battery release latch 7. Disconnect any external devices and remove any cards before working on your computer: To remove a card, such as an ExpressCard, see the Dell™ Technology Guide at support.dell.com. To undock from a docking device, see the E-Port User's Guide or the E-Port Plus User's Guide at support.dell.com. 8. Turn the computer topside up, open the display, and press the power button to ground the system board. After Working on Your Computer After you have completed the replacement procedures, ensure you connect the external devices, cards, and cables before turning on your computer. NOTE: To avoid damage to the computer, use only the battery designed for this particular Dell computer. Do not use batteries designed for other Dell computers. 1. Connect external devices, replace cards, and connect telephone or network cables to your computer. 2. Slide the battery into the battery bay and snap it into place. 3. Connect your computer and attached devices to their electrical outlets. 4. Turn on your computer. Back to Contents Page Back to Contents Page Base Assembly Dell Precision™ M6400 Service Manual Removing the Base Assembly Cover Replacing the Base Assembly Cover Removing the Base Assembly Replacing the Base Assembly CAUTION: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage on at: Removing the Base Assembly Cover 1. Follow the procedures in Before Working on Your Computer. 2. Close the display and turn the computer upside down. 3. Remove the two M2 x 3-mm screws. 4. Slide the cover toward the front of the computer to release the tabs from the base assembly. 5. Remove the cover from the base assembly. 1 M2 x 3-mm screws (2) 2 cover 3 bottom tabs (10) 4 front of the computer Replacing the Base Assembly Cover 1. Align the tabs with the slots on the base assembly. 2. Slide the cover toward the back of the computer to engage the tabs and firmly attach the cover to the base assembly. 3. Replace the M2 x 3-mm screws. 4. Follow the procedures in After Working on Your Computer. Removing the Base Assembly 1. Follow the procedures in Before Working on Your Computer. 2. Remove the base assembly cover (see Removing the Base Assembly Cover). 3. Remove the primary hard drive (see Removing the Primary Hard Drive (HDD1)) and the secondary hard drive (see Removing the Secondary Hard Drive (HDD2)). 4. Remove the optical drive (see Removing the Optical Drive). 5. Remove the LED cover (see Removing the LED Cover). 6. Remove the keyboard (see Removing the Keyboard). 7. Remove the display assembly (see Removing the Edge-to-Edge Display or Removing the Display Assembly). 8. Remove the palm rest (see Removing the Palm Rest Assembly). 9. Remove the fan (see Removing the Fan). 10. Remove the processor heatsink assembly (see Removing the Processor Heatsink Assembly). 11. Remove the video card/heatsink assembly (see Removing the Video Card/Heatsink Assembly). 12. Remove the card cage (see Removing the Card Cage). 13. Remove the left I/O board (see Removing the Left I/O Board). 14. Remove the right I/O board (see Removing the Right I/O Board). 15. Remove the system board (see Removing the System Board). Replacing the Base Assembly 1. Replace the system board (see Replacing the System Board). 2. Replace the right I/O board (see Replacing the Right I/O Board). 3. Replace the left I/O board (see Replacing the Left I/O Board). 4. Replace the card cage (see Replacing the Card Cage). 5. Replace the video card/heatsink assembly (see Replacing the Video Card/Heatsink Assembly). 6. Replace the processor heatsink assembly (see Replacing the Processor Heatsink Assembly). 7. Replace the fan (see Replacing the Fan). 8. Replace the palm rest (see Replacing the Palm Rest Assembly). 9. Replace the display assembly (see Replacing the Edge-to-Edge Display or Replacing the Display Assembly). 10. Replace the keyboard (see Replacing the Keyboard). 11. Replace the LED cover (see Replacing the LED Cover). 12. Replace the optical drive (see Replacing the Optical Drive). 13. Replace the primary hard drive (see Replacing the Primary Hard Drive (HDD1)) and the secondary hard drive...