Hello
The first thing I tend to do with any fault on a computer or related hardware, is to turn it off, unplug it from the power supply, turn off and unplug the rest of the system components. Wait for a few minutes, plug the equipment back in and turn all components on and then reboot the computer.
If you have already done all this then I suspect that you will need to find out more about the error. You can download various manuals for your machine from here:-
Canon PIXMA MX860
This may give you some idea of the more common errors and how to fix them. If this doesn't work then the ultimate thing to do is to remove the printer and its drivers from the computer and reload the drivers from the disks supplied with the printer.
Hope this is helpful, if so would you please register that with Fixya
Cheers
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