How to Reset an HP C4580 Printer

Turn off the printer by pressing the 'Power' button on the front.
Turn the printer around and remove the power cord from the back.
Unplug the power cord from the electrical socket.
Wait for 30 seconds.
Reconnect the power cord to the electrical outlet.
Reconnect the power cord to the rear of the printer.
Turn the printer back on by pressing the 'Power' button again.