Acer Extensa 5220 - Manual (Page 78)

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Installing memory
Follow these steps to install memory:
1 Turn off the computer, unplug the AC adapter (if connected) and remove
the battery pack. Then turn the computer over to access its base.
2 Remove the screws from the memory cover; then lift up and remove the
memory cover.
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.
BIOS utility
The BIOS utility is a hardware configuration program built into your
computer's BIOS.
Your computer is already properly configured and optimized, and you do not
need to run this utility. However, if you encounter configuration problems, you
may need to run it.
To activate the BIOS utility, press during the POST; while the notebook PC
logo is being displayed.
Boot sequence
To set the boot sequence in the BIOS utility, activate the BIOS utility, then select
Boot from the categories listed at the top of the screen.