Gateway GT4015 Hardware Reference Manual page 36

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Loosen the four screws that secure the heat sink to the system board, then
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remove the heat sink.
Screws
Release the processor from the old system board by pushing down on the
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lever and then lifting it completely up.
Remove the processor from the old system board.
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Install the processor onto the new system board making sure that Pin 1
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on the processor (indicated by the silk-screened arrow on the corner of
the processor) aligns with Pin 1 on the processor socket (indicated by the
absence of a pin hole in the processor socket), then return the lever to its
locked position.
Install the power supply into the case, then install the three screws to
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secure the power supply to the case.
Connect the power and data cables using your notes from
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Place the heat sink over the processor, then tighten the screws that secure
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it to the system board.
Connect the new fan cable to the system board, then insert the new fan
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into place.
Install the memory you removed previously.
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Replacing the system board
Screws
Step 9.
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