Epson Stylus Pro 4000 Reference Manual page 276

For Windows
Click the Main tab and make sure that the correct ink set is
displayed. If not, set the information manually by clicking the
Utility tab, then the Printer and Option Information button.
For Mac OS 8.6 to 9.x
Select Chooser from the Apple menu and click the printer's icon
and printer port.
For Mac OS X
Remove the installed printer driver from the Print Center, and
then reinstall it.
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Maintenance and Transportation