AOpen 1557 User Manual page 8

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2. Connect one end of the AC adapter to the DC-in port on the computer's rear
panel (1); connect the power cord to the AC adapter (2) and the other end to a
properly grounded power outlet (3).
3. Press the display cover release latch (1) and open the display (2) to a
comfortable viewing angle. Press the power switch (3) to turn on the power.
The POST (power-on self-test) routine executes and Windows begins
loading.