Lexmark has an updated driver
for that printer that runs on Mac OS X 10.5.x.
When you go to this page, search for your printer in the Search box on the left side and then follow the prompts to download.
The driver on the disk is for 10.4 and older.
Follow the link and download the new driver and install it. Then, go to your System Preferences and click on Print & Fax.
Remove the current printer installed and then make sure your printer is turned on.
Click the + sign and add the printer again.
It should now work as expected.
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