Lenovo ThinkStation Hardware Maintenance Manual page 86

b. If your computer has six memory slots on the system board, you might have to use more force to
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remove the memory module installed in memory slot .
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8. Position the new memory module over the memory slot. Make sure that the notch on the memory
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module aligns correctly with the key in the memory slot. Push the memory module straight down into
the slot until the retaining clips close.
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ThinkStation Hardware Maintenance Manual