Introduction

This guide show you how to remove and replace the motherboard in a Dell Optiplex GX620.

Power down your PC and remove the power cord from the back. Power down your PC and remove the power cord from the back.
  • Power down your PC and remove the power cord from the back.

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Press and hold the power button for about 10 seconds, then release. This helps drain any remaining power stored in the capacitors, so that you can safely work on the internal components.
  • Press and hold the power button for about 10 seconds, then release.

    • This helps drain any remaining power stored in the capacitors, so that you can safely work on the internal components.

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With the computer standing upright, firmly pull on the tab at the back of the computer.
  • With the computer standing upright, firmly pull on the tab at the back of the computer.

  • When the side panel pops free, gently pull the panel away from the computer.

  • If you have trouble freeing the side panel from the case, you may need to pull the tab a bit harder.

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Move the cables out of your way. SATA Power SATA Data
  • Move the cables out of your way.

  • SATA Power

  • SATA Data

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Unplug the power cable Unplug the data cable Unplug the data cable
  • Unplug the power cable

  • Unplug the data cable

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Unplug the fan that is on the motherboard. Unplug the fan that is on the motherboard.
  • Unplug the fan that is on the motherboard.

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There is two Phillips #2 screws that need to be removed. The two screws have springs that keep them there.
  • There is two Phillips #2 screws that need to be removed.

  • The two screws have springs that keep them there.

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Lift the heat sink. Lift the heat sink. Lift the heat sink.
  • Lift the heat sink.

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Push and release tap on it. And then take the CPU out. Remember to put new thermal paste on the CPU. Remember to put new thermal paste on the CPU.
  • Push and release tap on it. And then take the CPU out.

  • Remember to put new thermal paste on the CPU.

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Push the tabs down. Pull the cards out.
  • Push the tabs down.

  • Pull the cards out.

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Pull the two cables from the DVD drive off. Pull the two cables from the DVD drive off. Pull the two cables from the DVD drive off.
  • Pull the two cables from the DVD drive off.

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Pull the power cable from the DVD drive off. Pull the power cable from the DVD drive off.
  • Pull the power cable from the DVD drive off.

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Pull the CPU power cable off.
  • Pull the CPU power cable off.

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Pull the three cables off. Pull the three cables off.
  • Pull the three cables off.

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Push the tab to releases the latch. Push the tab and pull the graphics card out. Push the tab and pull the graphics card out.
  • Push the tab to releases the latch.

  • Push the tab and pull the graphics card out.

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Remove the six Philips #2 screws. Remove the two green Philips #2 screws.
  • Remove the six Philips #2 screws.

  • Remove the two green Philips #2 screws.

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Gently pull the motherboard out. Gently pull the motherboard out. Gently pull the motherboard out.
  • Gently pull the motherboard out.

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Conclusion

To reassemble your device, follow these instructions in reverse order.

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Padraic Hoselton

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