New power button
In order to meet some requirements in energy regulations, the new Lexmark 2500+ Dot Matrix printers do not come with a power switch by design.
In these models, the Start/Stop (green) button on the front panel basically functions as the power switch. See the following front panel illustration.
The printer’s Start/Stop button serves as the new power switch. The printer is in Ready mode if the Power LED is green. On the other hand, an orange/amber color represents the printer in power down mode.
To power down the printer, simply hold the Start/Stop button for five seconds. In actuality the printer will still have one LED lit which is an orange/amber color. The printer in this mode is consuming less than (<) 1/2 watt of power.