My machine has suddenly stopped printing.

Turning the power ON/OFF while the print monitor screen is displayed may cause the printer driver to go off-line, and therefore make printing impossible.
In this case, open the [Printers / Printers and Faxes] folder of Windows and check if your printer driver is shown as off-line.
If it is off-line, close the print monitor screen and turn your printer power ON/OFF a few times. If this procedure is unable to make the printer driver go on-line, restart the computer.

FAQs & Troubleshooting