Acer Altos G300 - Manual (Page 45)

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Opening your system
Caution: Before you proceed, make sure that you have turned
off your computer and all peripherals connected to it. Read the
“Preinstallation instructions” on page 31.
You need to open your computer before you can install additional
components. See the following section for instructions.
Removing the front panel
1 Unlock the door lock.
2 Insert your hand in the opening under the front panel. Reach for
the panel handle and press it to release the cover from the
housing frame.
3 Pull the cover to detach it completely from the frame.