Cause of printer not responding:

1. Check printer settings and device connection.
2. If printer is connected to computer or network, try turning it off, then on again and also check all cables for any damage.
3. Check system preferences and make sure the prefered printer is selected.
4. Ensure that the printer is selected as the default printer.
5. If the printer is wireless, check if the wireless router is connected or reconnect it.
6. Verify printer driver is up to date, download the most recent version if necessary.