Dell Vostro A90 Setup And Quick Reference Manual page 14

Quick Setup
2 Connect the network cable.
3 Connect USB devices, such as a mouse or
keyboard.
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4 Open the computer display and press the
power button to turn on the computer.
NOTE: It is recommended that you turn on
and shut down your computer at least once
before you install any cards or connect the
computer to a docking device or other
external device, such as a printer.
5 Connect to the Internet. See "Connecting to
the Internet" on page 16 for more information.