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.

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Press and hold the power button for about 10 seconds, then release.
  • 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.

  • 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

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  • Unplug the power cable

  • Unplug the data cable

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  • 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.

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  • 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.

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  • Push the tabs down.

  • Pull the cards out.

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  • Pull the two cables from the DVD drive off.

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  • Pull the power cable from the DVD drive off.

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  • Pull the CPU power cable off.

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  • 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.

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  • Remove the six Philips #2 screws.

  • Remove the two green Philips #2 screws.

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  • 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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