HP Deskjet 5740 Color Inkjet Printer - Manual (Page 85)

Uninstall, and then reinstall, the software.
“Two-way communication cannot be established” or “Printer not responding”
The printer might not be able to communicate with the computer if the USB cable is too
long.
If you receive this error message, make sure that the USB cable is not greater than 5
meters (approximately 16 feet, 5 inches) in length.
Printer lights are on or flashing
● What the lights indicate
● Power light is flashing
● Resume light is flashing
● Print Cartridge Status light is on or flashing
● All lights are flashing
What the lights indicate
The printer lights indicate the printer status.
1 Power light
2 Print Cartridge Status lights
3 Resume light
User's Guide 83