Acer Aspire Timeline 1810T User Manual page 60

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3 (a) Insert the memory module diagonally into the slot, then (b) gently press
it down until it clicks into place.
4 Replace the memory cover and secure it with the screw.
5 Reinstall the battery pack, and reconnect the AC adapter.
6 Turn on the computer.
The computer automatically detects and reconfigures the total memory size.
Please consult a qualified technician or contact your local Acer dealer.