Steps to troubleshoot printer problems on a Mac:

• Press Command-P one more. In the Print dialogue box, you'll most likely notice a badge icon, such as an exclamation point, next to the printer's name.
• Select System Preferences from the Apple menu. Select your printer from the list by clicking Print & Scan, and then click Open Print Queue. The Print Queue's Resume button has the same effect as the Print dialogue box's Resume button.
• Nowadays, most printer software updates are performed through OS X's Software Update. Select Software Update from the Apple menu. If an update for your printer's brand is available, download it and install it. If not, there's still a chance that an update is available on the printer's website. If that's the case, go ahead and download and install it.
• Select Print & Scan from the Apple Menu > System Preferences. Select your printer from the list on the left. At the bottom of the list, click the minus-sign (-) button. The printer will be removed from the print list as a result of this action.
• Now press the plus-sign (+) key. There will be a menu. Hopefully, the recently deleted printer will appear under the heading Nearby Printers. If this is the case, pick it to restore it. If you don't already have one, choose Add Printer or Scanner. Hopefully, the printer will appear in the Default listings once more. If yes, click Add after selecting it from the list.

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