Canon i 850 - Manual (Page 142)

Printer Does Not Start or Stops During Print Jobs 142
Troubleshooting
■ Check whether there is any problem with the computer.
Restart the computer, and if any print jobs remain, delete them.
Windows
1
Open the Printer Properties Dialog Box from the Start menu.
2
Click the Utility tab, and click Start Status Monitor.
3
Click Display Print Queue on the BJ Status Monitor.
4
Select Cancel All Documents from the Printer menu.
Macintosh
1
Open the BJ Print Monitor from the application menu.
2
Click to select an undesired document and click .
The print job is deleted.