Gateway 450Sx4 Service Manual page 22

10
Hold the new or replacement module at a 30-degree angle and press it 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.
11
Gently press the module down until it clicks into place.
12
Replace the memory bay cover and tighten the captive screw.
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Adding or replacing memory modules
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