Hi js11465,
Printer offline may indicate that the printer driver is not configured properly. Please try the following to resolve the issue:
1. Click Start.
2. Click Control Panel.
3. Click Hardware and Sound.
4. Click Devices and Printers.
5. Right click the PIXMA MX512 Printer and click Printer Properties.
6. Click the Ports tab.
7. Make sure that the checkmark is on the port that starts with CNBJNP, then click OK and try to print.
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