HP 3740 series - Manual (Page 6)

1. Print cartridges
1. USB port
4.2 Power button and light
The Power button turns the printer on and off. It can take a few seconds for the
printer to turn on after you press the Power button. The light on the Power button
flashes when the printer is processing a job.
1. Power button and light
HP Deskjet 3740 series printer User's Guide
6