Re: Dell AIO 942 photo printer
Check all the cords--power, usb-- at both ends. Unplug them and hold the power button down on the printer for 10 seconds then plug in again and turn on the printer. Try a different usb port on the back of the computer if it's a desktop. Reinstall the printer to see if it is recognized by the computer. Any lights or messages on the printer? Can you attach the printer to another computer to see if the computer has the problem?
The Printer forum is located under Peripherals and that has the printer experts. Post your computer model and operating system next time you post.