Dell 968 All In One Photo Printer - Manual (Page 30)

9 Power
button
When the printer is off, press the Power button to turn your
printer on.
When the printer is on, press the Power button to put your
printer in a Power Save state. Your printer consumes minimal
power in this state.
When the printer is on or in the Power Save state, press and hold
the Power button for 2 seconds to turn your printer off.
NOTE: Do not unplug your printer from the electrical outlet when not
in use. When the printer is off, it requires up to 1 watt of power to
perform regular maintenance on cartridges.