Gateway 450RGH Service Manual page 15

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Hold the new or replacement module at a 30-degree angle and press it
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into the empty memory slot. This module is keyed so it can only be
inserted in one direction. If the module does not fit, make sure that the
notch in the module lines up with the tab in the memory slot.
Gently push the module down until it clicks in place.
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Replace the memory bay cover and tighten the cover screw.
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Adding or replacing memory modules
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